Posted by jackcarles (johncarles@…>)
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.
Thanks
Jack
Posted by Jay Glen (svfantasy@…>)
Jack,Try Boatdiesel.com, they have a lot of info on diesels and selecting the right prop, including a calculator in which you plug in your displacement, horsepower and gear ratio to determine the correct prop size.
On 9/4/07, jackcarles <johncarles@…> wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.
Thanks
Jack
– Jay Glen ki6jtks/v FantasyFreedom 40 Cat-KetchSan Francisco Bay Area
Posted by Larry Kraus (kracherlandl@…>)
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.
Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Alan Kusinitz (akusinitz@…>)
I have the 3GM on my F-33. I put on a vari
prop adjustable pitch 3 blade propeller. The manufacturer calculated forward
and reverse pitch settings based on the engine and transmission reduction (note
on the 3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off the plate
on the transmission). They also made it a customer blade size.
I started with their recommendations. I
then adjusted based on maximum RPM in flat water. In other words with the
throttle at full I expected to see the rated RPM of 3400-3500. The manufacturer
calculations were slightly overpowered for my boat. I adjusted slightly. On my
33 in flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.
Alan
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Wednesday, September 05,
2007 10:21 AM
To:
FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup]
prop for Hoyt 32
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.
Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
\
Posted by Larry Kraus (kracherlandl@…>)
Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.
LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Alan Kusinitz (akusinitz@…>)
Engine RPM. I wonder if you have shaft
alignment problems? What is the rated RPM for the 2GM? Remember mine is a 3GM.
Alan
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Wednesday, September 05,
2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup]
prop for Hoyt 32
Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.
LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade
size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
[mailto:FreedomOwnersGroup@yahoogroups.com]
*On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
\
Posted by Herman and Gail Schiller (hschiller2@…>)
Max RPM for the 2GM20F is 3600 RPM. Herm
At 02:56 PM 9/5/2007, you wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is
the rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From:
mailto:FreedomOwnersGroup%40yahoogroups.comFreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To:
mailto:FreedomOwnersGroup%40yahoogroups.comFreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Larry Kraus (kracherlandl@…>)
Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.
My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?
By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?
LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Al Lorman (ajl@…>)
I
have a 1987 2GM20F; I believe that the 2GM20 and the 3GM30F have the same rpm
ratings; max at 3600, continuous at 3400. Cruising is about 80% of
continuous, or about 2700. The older 3GMs may differ.
Al
Lorman
F30
Ab Initio
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On
Behalf Of Larry Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
\
Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.
My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?
By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?
LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
[mailto:FreedomOwnersGroup@yahoogroups.com]
*On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse
pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade
size.I started with their recommendations. I then adjusted based on
maximum
RPM in flat water. In other words with the throttle at full I
expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry
KrausSent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP.
My
boat doesn’t go well under power and after clearing the engine
of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
\
Posted by Alan Kusinitz (akusinitz@…>)
Mine is beneath my companionway. There is
no active ventilation. The engine compartment is open to the bilge and back
toward the transom but there are no vents. The compartment gets quite warm.
Diesels don’t need air cooling but they do need to be able to draw air in
so it shouldn’t be a completely sealed compartment.
Transmission info is KM3D # 0765
Reduction Ratio 2.61 forward, 3.16 reverse
If your reduction ratio is similar you
should be able to reach 3400-3600 unless your prop is oversized or over
pitched. I have no trouble running at full throttle and maintaining 7.4 knots
in flat water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be conservative in
general and on fuel usage.
I did have a problem with my throttle
(which is mounted on my edson pedestal) hitting the pedestal guard. I couldn’t
adjust enough to resolve this so I had the throttle handle bent a little in a
press.
Alan
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Wednesday, September 05,
2007 3:50 PM
To:
FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup]
prop for Hoyt 32
Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.
My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?
By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?
LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
[mailto:FreedomOwnersGroup@yahoogroups.com]
*On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse
pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer
blade size.I started with their recommendations. I then adjusted based on
maximum
RPM in flat water. In other words with the throttle at full I
expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On
Behalf Of *Larry KrausSent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP.
My
boat doesn’t go well under power and after clearing the engine
of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
\
Posted by fred (fredmolden@…>)
I agree with Alan. After checking
the Yanmar manual the 2GM20 and 3GM30 are rated at 16 and 24.1 hp respectively at
a continuous engine RPM of 3400. The 1 hour rating is 200 RPM higher and
adds 2 to 3 hp. I also run cruising speed at 80% of 3400 or 2500 - 2800 rpm.
But I would run it at 3500 if I needed it for an hour or less. The
interesting point is that to get the full rated engine hp you need to get the
rpm’s up to spec. If you are propped correctly then you can get the
rpm and you will run at a higher rpm while maintaining cruising speed.
Always a trade off.
I also noted that each engine had three transmissions
ratios available giving propeller speeds of 1540/1298/1055 rpm for the 2GM20
and 1441/1303/1062 rpm for the 3GM30. Obviously each different ratio
would require a different pitch prop. Talk to your prop manufacturer he probably
has a table giving the pitch for every engine and transmission type. Of
course each boat is different as well, loaded to the waterline or not and so
on. Tweaking. and trade offs.
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Alan Kusinitz
Sent: Wednesday, September 05,
2007 4:50 PM
To:
FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup]
prop for Hoyt 32
Mine is beneath my companionway. There is no active ventilation.
The engine compartment is open to the bilge and back toward the transom but
there are no vents. The compartment gets quite warm. Diesels don’t need
air cooling but they do need to be able to draw air in so it shouldn’t be
a completely sealed compartment.
Transmission info is KM3D # 0765 Reduction Ratio 2.61
forward, 3.16 reverse
If your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have no
trouble running at full throttle and maintaining 7.4 knots in flat water and in
some ways the engine is smoother (but louder) at the higher RPM, but I
generally run in the 2400-2800 range to be conservative in general and on fuel
usage.
I did have a problem with my throttle (which is mounted on my edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to resolve
this so I had the throttle handle bent a little in a press.
Alan
From: FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com]
On Behalf Of Larry Kraus
Sent: Wednesday, September 05,
2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup]
prop for Hoyt 32
Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.
My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?
By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?
LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
[mailto:FreedomOwnersGroup@yahoogroups.com]
*On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse
pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer
blade size.I started with their recommendations. I then adjusted based on
maximum
RPM in flat water. In other words with the throttle at full I
expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On
Behalf Of *Larry KrausSent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP.
My
boat doesn’t go well under power and after clearing the engine
of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
\
Posted by Larry Kraus (kracherlandl@…>)
Great info Alan. Thank you!
My throttle and shift is attached to the starboard cockpit wall, next to
the skipper’s feet. There’s an indentation in the wall for mounting the
panel with gages, idiot lites, and the shift/throttle. The throttle hits
this indentation preventing full throttle forward.
I’ll try to get more tranny and engine information when I’m there in a
couple of weeks.
Thanks again,
LK
Alan Kusinitz wrote:
Mine is beneath my companionway. There is no active ventilation. The
engine compartment is open to the bilge and back toward the transom
but there are no vents. The compartment gets quite warm. Diesels don’t
need air cooling but they do need to be able to draw air in so it
shouldn’t be a completely sealed compartment.Transmission info is KM3D # 0765 Reduction Ratio 2.61 forward, 3.16
reverseIf your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have no
trouble running at full throttle and maintaining 7.4 knots in flat
water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be
conservative in general and on fuel usage.I did have a problem with my throttle (which is mounted on my edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to
resolve this so I had the throttle handle bent a little in a press.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade
size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Alan Kusinitz (akusinitz@…>)
FYI in case it helps, the prop on my F-33
is a Variprop 3 bladed 15.5” diameter. I’ve run it from 11 to 13
inches of pitch and my preference is 12 in forward. Not sure what you
have on your F-32
Alan
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of fred
Sent: Wednesday, September 05,
2007 5:41 PM
To:
FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup]
prop for Hoyt 32
I agree with Alan. After checking the Yanmar manual the 2GM20
and 3GM30 are rated at 16 and 24.1 hp respectively at a continuous engine RPM
of 3400. The 1 hour rating is 200 RPM higher and adds 2 to 3 hp. I
also run cruising speed at 80% of 3400 or 2500 - 2800 rpm. But I would run it
at 3500 if I needed it for an hour or less. The interesting point is that
to get the full rated engine hp you need to get the rpm’s up to spec.
If you are propped correctly then you can get the rpm and you will run at
a higher rpm while maintaining cruising speed. Always a trade off.
I also noted that each engine had three transmissions ratios
available giving propeller speeds of 1540/1298/1055 rpm for the 2GM20 and
1441/1303/1062 rpm for the 3GM30. Obviously each different ratio would
require a different pitch prop. Talk to your prop manufacturer he
probably has a table giving the pitch for every engine and transmission
type. Of course each boat is different as well, loaded to the waterline
or not and so on. Tweaking. and trade offs.
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Alan Kusinitz
Sent: Wednesday, September 05,
2007 4:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup]
prop for Hoyt 32
Mine is beneath my companionway. There is no active ventilation.
The engine compartment is open to the bilge and back toward the transom but there
are no vents. The compartment gets quite warm. Diesels don’t need air
cooling but they do need to be able to draw air in so it shouldn’t be a
completely sealed compartment.
Transmission info is KM3D # 0765 Reduction Ratio 2.61
forward, 3.16 reverse
If your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have no
trouble running at full throttle and maintaining 7.4 knots in flat water and in
some ways the engine is smoother (but louder) at the higher RPM, but I
generally run in the 2400-2800 range to be conservative in general and on fuel
usage.
I did have a problem with my throttle (which is mounted on my edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to resolve
this so I had the throttle handle bent a little in a press.
Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Wednesday, September 05,
2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup]
prop for Hoyt 32
Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.
My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?
By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?
LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
[mailto:FreedomOwnersGroup@yahoogroups.com]
*On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse
pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer
blade size.I started with their recommendations. I then adjusted based on
maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On
Behalf Of *Larry KrausSent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP.
My
boat doesn’t go well under power and after clearing the engine
of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
\
Posted by Larry Kraus (kracherlandl@…>)
Thanks for the info Fred. I’m going to check out my trans and motor
labels on the boat when I’m up there in 2 weeks.
LK
fred wrote:
I agree with Alan. After checking the Yanmar manual the 2GM20 and
3GM30 are rated at 16 and 24.1 hp respectively at a continuous engine
RPM of 3400. The 1 hour rating is 200 RPM higher and adds 2 to 3 hp. I
also run cruising speed at 80% of 3400 or 2500 - 2800 rpm. But I would
run it at 3500 if I needed it for an hour or less. The interesting
point is that to get the full rated engine hp you need to get the
rpm’s up to spec. If you are propped correctly then you can get the
rpm and you will run at a higher rpm while maintaining cruising speed.
Always a trade off.I also noted that each engine had three transmissions ratios available
giving propeller speeds of 1540/1298/1055 rpm for the 2GM20 and
1441/1303/1062 rpm for the 3GM30. Obviously each different ratio would
require a different pitch prop. Talk to your prop manufacturer he
probably has a table giving the pitch for every engine and
transmission type. Of course each boat is different as well, loaded to
the waterline or not and so on. Tweaking. and trade offs.
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Alan Kusinitz
Sent: Wednesday, September 05, 2007 4:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32Mine is beneath my companionway. There is no active ventilation. The
engine compartment is open to the bilge and back toward the transom
but there are no vents. The compartment gets quite warm. Diesels don’t
need air cooling but they do need to be able to draw air in so it
shouldn’t be a completely sealed compartment.Transmission info is KM3D # 0765 Reduction Ratio 2.61 forward, 3.16
reverseIf your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have no
trouble running at full throttle and maintaining 7.4 knots in flat
water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be
conservative in general and on fuel usage.I did have a problem with my throttle (which is mounted on my edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to
resolve this so I had the throttle handle bent a little in a press.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade
size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Larry Kraus (kracherlandl@…>)
Hi Alan,
I won’t know about the prop until the boat is pulled for the winter in
mid October. Then I can couple the motor, transmission and prop data
together. Your guidance has been a great help.
Thanks,
LK
Alan Kusinitz wrote:
FYI in case it helps, the prop on my F-33 is a Variprop 3 bladed 15.5”
diameter. I’ve run it from 11 to 13 inches of pitch and my preference
is 12 in forward. Not sure what you have on your F-32Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *fred
Sent: Wednesday, September 05, 2007 5:41 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32I agree with Alan. After checking the Yanmar manual the 2GM20 and
3GM30 are rated at 16 and 24.1 hp respectively at a continuous engine
RPM of 3400. The 1 hour rating is 200 RPM higher and adds 2 to 3 hp. I
also run cruising speed at 80% of 3400 or 2500 - 2800 rpm. But I would
run it at 3500 if I needed it for an hour or less. The interesting
point is that to get the full rated engine hp you need to get the
rpm’s up to spec. If you are propped correctly then you can get the
rpm and you will run at a higher rpm while maintaining cruising speed.
Always a trade off.I also noted that each engine had three transmissions ratios available
giving propeller speeds of 1540/1298/1055 rpm for the 2GM20 and
1441/1303/1062 rpm for the 3GM30. Obviously each different ratio would
require a different pitch prop. Talk to your prop manufacturer he
probably has a table giving the pitch for every engine and
transmission type. Of course each boat is different as well, loaded to
the waterline or not and so on. Tweaking. and trade offs.
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Alan Kusinitz
Sent: Wednesday, September 05, 2007 4:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32Mine is beneath my companionway. There is no active ventilation. The
engine compartment is open to the bilge and back toward the transom
but there are no vents. The compartment gets quite warm. Diesels don’t
need air cooling but they do need to be able to draw air in so it
shouldn’t be a completely sealed compartment.Transmission info is KM3D # 0765 Reduction Ratio 2.61 forward, 3.16
reverseIf your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have no
trouble running at full throttle and maintaining 7.4 knots in flat
water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be
conservative in general and on fuel usage.I did have a problem with my throttle (which is mounted on my edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to
resolve this so I had the throttle handle bent a little in a press.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade
size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Posted by Alan Kusinitz (akusinitz@…>)
Glad its helpful. Let me know how it turns out.
Alan
-----Original Message-----
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Thursday, September 06, 2007 9:57 AM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32
Hi Alan,
I won’t know about the prop until the boat is pulled for the winter in
mid October. Then I can couple the motor, transmission and prop data
together. Your guidance has been a great help.
Thanks,
LK
Alan Kusinitz wrote:
FYI in case it helps, the prop on my F-33 is a Variprop 3 bladed 15.5"
diameter. I’ve run it from 11 to 13 inches of pitch and my preference
is 12 in forward. Not sure what you have on your F-32Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *fred
Sent: Wednesday, September 05, 2007 5:41 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32I agree with Alan. After checking the Yanmar manual the 2GM20 and
3GM30 are rated at 16 and 24.1 hp respectively at a continuous engine
RPM of 3400. The 1 hour rating is 200 RPM higher and adds 2 to 3 hp. I
also run cruising speed at 80% of 3400 or 2500 - 2800 rpm. But I would
run it at 3500 if I needed it for an hour or less. The interesting
point is that to get the full rated engine hp you need to get the
rpm’s up to spec. If you are propped correctly then you can get the
rpm and you will run at a higher rpm while maintaining cruising speed.
Always a trade off.I also noted that each engine had three transmissions ratios available
giving propeller speeds of 1540/1298/1055 rpm for the 2GM20 and
1441/1303/1062 rpm for the 3GM30. Obviously each different ratio would
require a different pitch prop. Talk to your prop manufacturer he
probably has a table giving the pitch for every engine and
transmission type. Of course each boat is different as well, loaded to
the waterline or not and so on. Tweaking. and trade offs.
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Alan Kusinitz
Sent: Wednesday, September 05, 2007 4:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32Mine is beneath my companionway. There is no active ventilation. The
engine compartment is open to the bilge and back toward the transom
but there are no vents. The compartment gets quite warm. Diesels don’t
need air cooling but they do need to be able to draw air in so it
shouldn’t be a completely sealed compartment.Transmission info is KM3D # 0765 Reduction Ratio 2.61 forward, 3.16
reverseIf your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have no
trouble running at full throttle and maintaining 7.4 knots in flat
water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be
conservative in general and on fuel usage.I did have a problem with my throttle (which is mounted on my edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to
resolve this so I had the throttle handle bent a little in a press.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Alan,
I’m looking for the type of performance that you are getting out of your
prop/drive train combination.My engine is a 3GM(x) as well. I don’t have my manuals in front of me so
I don’t remember the exact model number. But it is a 3 cylinder Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what the
rated RPM is. When chartering, I have been restricted to 2000 RPM on all
diesel engines. Further, my throttle handle hits the frame around the
instrument panel when the rpms are about 2200. The sound of the drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be uncomfortable
at 3400-3600 rpm. Am I reading you correctly?By the way, is your motor located in the middle of the boat? Mine is and
there is no apparent ventilation of the motor area. It actually gets
quite hot in the motor area of boat. Utensils in drawers get warm etc.
How is your motor compartment ventilated?LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full throttle
at 2000 motor rpm. Much above that and I get a shudder that feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable pitch 3
blade propeller. The manufacturer calculated forward and reverse pitch
settings based on the engine and transmission reduction (note on the
3GM their were several different possible transmissions and reduction
ratings. The ones in my manual were incorrect. I read the actuals off
the plate on the transmission). They also made it a customer blade
size.I started with their recommendations. I then adjusted based on maximum
RPM in flat water. In other words with the throttle at full I expected
to see the rated RPM of 3400-3500. The manufacturer calculations were
slightly overpowered for my boat. I adjusted slightly. On my 33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry
Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30, 27 HP. My
boat doesn’t go well under power and after clearing the engine of
blame, I’m left with the prop as the problem. Does anyone have
experience with this engine and alternative prop matings? I’d
appreciate all help.Thanks
Jack
Yahoo! Groups Links
Posted by Alan (akusinitz@…>)
I guess you could also question the accuracy of your tachometer. I
have a tool called a vibration tachometer that just cost a few bucks.
Can’t remember where I got it. Its plastic and has a wire sticking
out of it. You place it on the engine and pull the wire in and out
until it vibrates little or in a circular motion and then read the
RPM from the dial.
But given the speeds you’ve mentioned it sure seems that its
something else.
Also are your engine mounts okay?
Alan
— In FreedomOwnersGroup@yahoogroups.com, “Alan Kusinitz”
<akusinitz@…> wrote:
Glad its helpful. Let me know how it turns out.
Alan-----Original Message-----
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Larry Kraus
Sent: Thursday, September 06, 2007 9:57 AM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
I won’t know about the prop until the boat is pulled for the winter
in
mid October. Then I can couple the motor, transmission and prop
data
together. Your guidance has been a great help.Thanks,
LK
Alan Kusinitz wrote:
FYI in case it helps, the prop on my F-33 is a Variprop 3 bladed
15.5"
diameter. I’ve run it from 11 to 13 inches of pitch and my
preference
is 12 in forward. Not sure what you have on your F-32Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *fred
Sent: Wednesday, September 05, 2007 5:41 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32I agree with Alan. After checking the Yanmar manual the 2GM20 and
3GM30 are rated at 16 and 24.1 hp respectively at a continuous
engine
RPM of 3400. The 1 hour rating is 200 RPM higher and adds 2 to 3
hp. I
also run cruising speed at 80% of 3400 or 2500 - 2800 rpm. But I
would
run it at 3500 if I needed it for an hour or less. The
interesting
point is that to get the full rated engine hp you need to get the
rpm’s up to spec. If you are propped correctly then you can get
the
rpm and you will run at a higher rpm while maintaining cruising
speed.
Always a trade off.I also noted that each engine had three transmissions ratios
available
giving propeller speeds of 1540/1298/1055 rpm for the 2GM20 and
1441/1303/1062 rpm for the 3GM30. Obviously each different ratio
would
require a different pitch prop. Talk to your prop manufacturer he
probably has a table giving the pitch for every engine and
transmission type. Of course each boat is different as well,
loaded to
the waterline or not and so on. Tweaking. and trade offs.
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Alan
Kusinitz
Sent: Wednesday, September 05, 2007 4:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32Mine is beneath my companionway. There is no active ventilation.
The
engine compartment is open to the bilge and back toward the
transom
but there are no vents. The compartment gets quite warm. Diesels
don’t
need air cooling but they do need to be able to draw air in so it
shouldn’t be a completely sealed compartment.Transmission info is KM3D # 0765 Reduction Ratio 2.61 forward,
3.16
reverseIf your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have
no
trouble running at full throttle and maintaining 7.4 knots in
flat
water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be
conservative in general and on fuel usage.I did have a problem with my throttle (which is mounted on my
edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to
resolve this so I had the throttle handle bent a little in a
press.Alan
From: FreedomOwnersGroup@yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com] *On Behalf Of *Larry
Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Alan,
I’m looking for the type of performance that you are getting out
of your
prop/drive train combination.My engine is a 3GM(x) as well. I don’t have my manuals in front
of me so
I don’t remember the exact model number. But it is a 3 cylinder
Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what
the
rated RPM is. When chartering, I have been restricted to 2000 RPM
on all
diesel engines. Further, my throttle handle hits the frame around
the
instrument panel when the rpms are about 2200. The sound of the
drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be
uncomfortable
at 3400-3600 rpm. Am I reading you correctly?By the way, is your motor located in the middle of the boat? Mine
is and
there is no apparent ventilation of the motor area. It actually
gets
quite hot in the motor area of boat. Utensils in drawers get warm
etc.
How is your motor compartment ventilated?LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What
is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of
*Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full
throttle
at 2000 motor rpm. Much above that and I get a shudder that
feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable
pitch 3
blade propeller. The manufacturer calculated forward and
reverse pitch
settings based on the engine and transmission reduction (note
on the
3GM their were several different possible transmissions and
reduction
ratings. The ones in my manual were incorrect. I read the
actuals off
the plate on the transmission). They also made it a customer
blade
size.I started with their recommendations. I then adjusted based
on maximum
RPM in flat water. In other words with the throttle at full I
expected
to see the rated RPM of 3400-3500. The manufacturer
calculations were
slightly overpowered for my boat. I adjusted slightly. On my
33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of
*Larry
Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and
adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30,
27 HP. My
boat doesn’t go well under power and after clearing the
engine of
blame, I’m left with the prop as the problem. Does anyone
have
experience with this engine and alternative prop matings?
I’d
appreciate all help.Thanks
Jack
Yahoo! Groups Links
Posted by Larry Kraus (kracherlandl@…>)
Good point on the motor mounts. This boat was originally from Long
Island. The motor mounts show some rust that we don’t see too often
inland in fresh water. I’ll check them out more thoroughly this fall.
Thank you,
LK
Alan wrote:
I guess you could also question the accuracy of your tachometer. I
have a tool called a vibration tachometer that just cost a few bucks.
Can’t remember where I got it. Its plastic and has a wire sticking
out of it. You place it on the engine and pull the wire in and out
until it vibrates little or in a circular motion and then read the
RPM from the dial.
But given the speeds you’ve mentioned it sure seems that its
something else.
Also are your engine mounts okay?
Alan— In FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com, “Alan Kusinitz”
<akusinitz@…> wrote:Glad its helpful. Let me know how it turns out.
Alan-----Original Message-----
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] On Behalf Of Larry Kraus
Sent: Thursday, September 06, 2007 9:57 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
I won’t know about the prop until the boat is pulled for the winter
in
mid October. Then I can couple the motor, transmission and prop
data
together. Your guidance has been a great help.Thanks,
LK
Alan Kusinitz wrote:
FYI in case it helps, the prop on my F-33 is a Variprop 3 bladed
15.5"
diameter. I’ve run it from 11 to 13 inches of pitch and my
preference
is 12 in forward. Not sure what you have on your F-32Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *fred
Sent: Wednesday, September 05, 2007 5:41 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32I agree with Alan. After checking the Yanmar manual the 2GM20 and
3GM30 are rated at 16 and 24.1 hp respectively at a continuous
engine
RPM of 3400. The 1 hour rating is 200 RPM higher and adds 2 to 3
hp. I
also run cruising speed at 80% of 3400 or 2500 - 2800 rpm. But I
would
run it at 3500 if I needed it for an hour or less. The
interesting
point is that to get the full rated engine hp you need to get the
rpm’s up to spec. If you are propped correctly then you can get
the
rpm and you will run at a higher rpm while maintaining cruising
speed.
Always a trade off.I also noted that each engine had three transmissions ratios
available
giving propeller speeds of 1540/1298/1055 rpm for the 2GM20 and
1441/1303/1062 rpm for the 3GM30. Obviously each different ratio
would
require a different pitch prop. Talk to your prop manufacturer he
probably has a table giving the pitch for every engine and
transmission type. Of course each boat is different as well,
loaded to
the waterline or not and so on. Tweaking. and trade offs.
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Alan
Kusinitz
Sent: Wednesday, September 05, 2007 4:50 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: RE: [FreedomOwnersGroup] prop for Hoyt 32Mine is beneath my companionway. There is no active ventilation.
The
engine compartment is open to the bilge and back toward the
transom
but there are no vents. The compartment gets quite warm. Diesels
don’t
need air cooling but they do need to be able to draw air in so it
shouldn’t be a completely sealed compartment.Transmission info is KM3D # 0765 Reduction Ratio 2.61 forward,
3.16
reverseIf your reduction ratio is similar you should be able to reach
3400-3600 unless your prop is oversized or over pitched. I have
no
trouble running at full throttle and maintaining 7.4 knots in
flat
water and in some ways the engine is smoother (but louder) at the
higher RPM, but I generally run in the 2400-2800 range to be
conservative in general and on fuel usage.I did have a problem with my throttle (which is mounted on my
edson
pedestal) hitting the pedestal guard. I couldn’t adjust enough to
resolve this so I had the throttle handle bent a little in a
press.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of *Larry
Kraus
Sent: Wednesday, September 05, 2007 3:50 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Alan,
I’m looking for the type of performance that you are getting out
of your
prop/drive train combination.My engine is a 3GM(x) as well. I don’t have my manuals in front
of me so
I don’t remember the exact model number. But it is a 3 cylinder
Yanmar,
and I have verified that it is a 20 HP motor. I don’t know what
the
rated RPM is. When chartering, I have been restricted to 2000 RPM
on all
diesel engines. Further, my throttle handle hits the frame around
the
instrument panel when the rpms are about 2200. The sound of the
drive
train becomes very rough above 2000 rpm so I have chosen to not go
higher. What I’m hearing you say is that you would not be
uncomfortable
at 3400-3600 rpm. Am I reading you correctly?By the way, is your motor located in the middle of the boat? Mine
is and
there is no apparent ventilation of the motor area. It actually
gets
quite hot in the motor area of boat. Utensils in drawers get warm
etc.
How is your motor compartment ventilated?LK
Alan Kusinitz wrote:
Engine RPM. I wonder if you have shaft alignment problems? What
is the
rated RPM for the 2GM? Remember mine is a 3GM.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of
*Larry Kraus
Sent: Wednesday, September 05, 2007 1:19 PM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Hi Alan,
Are you speaking of prop RPM or motor RPM? I consider my full
throttle
at 2000 motor rpm. Much above that and I get a shudder that
feels as
though the prop may be cavitating.LK
Alan Kusinitz wrote:
I have the 3GM on my F-33. I put on a vari prop adjustable
pitch 3
blade propeller. The manufacturer calculated forward and
reverse pitch
settings based on the engine and transmission reduction (note
on the
3GM their were several different possible transmissions and
reduction
ratings. The ones in my manual were incorrect. I read the
actuals off
the plate on the transmission). They also made it a customer
blade
size.I started with their recommendations. I then adjusted based
on maximum
RPM in flat water. In other words with the throttle at full I
expected
to see the rated RPM of 3400-3500. The manufacturer
calculations were
slightly overpowered for my boat. I adjusted slightly. On my
33 in
flat water I get about 6.4 knots at 2600 RPM and 7.5 at 3400.Alan
From: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
[mailto:FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com] *On Behalf Of
*Larry
Kraus
Sent: Wednesday, September 05, 2007 10:21 AM
To: FreedomOwnersGroup@yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
mailto:FreedomOwnersGroup%40yahoogroups.com
Subject: Re: [FreedomOwnersGroup] prop for Hoyt 32Jack,
I have the same problem w/ our F32. 20 hp Yanmar and
adjustable pitch
prop. I’ll post any progress I make.Larry Kraus
jackcarles wrote:
My Hoyt 32 was repowered (not by me) with a Yanmar 3GM30,
27 HP. My
boat doesn’t go well under power and after clearing the
engine of
blame, I’m left with the prop as the problem. Does anyone
have
experience with this engine and alternative prop matings?
I’d
appreciate all help.Thanks
Jack
Yahoo! Groups Links