Backing the F-33

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1

Posted by tgcmd (Finesse@…>)

Can anyone tell me anything about the backing characterists of the
F-33 under power. The boat I am looking at has a fixed, 2-blade prop.
When the owner backed the boat out of the slip for a sea trial, he had
more trouble than I have ever seen, except for some boats with folding
props. Is that normal?

2

Posted by cgb323 (c3g2b3@…>)

— In freedomyachts2003@yahoogroups.com, “tgcmd” <Finesse@s…>
wrote:

Can anyone tell me anything about the backing characterists of the
F-33 under power. The boat I am looking at has a fixed, 2-blade
prop.
When the owner backed the boat out of the slip for a sea trial, he
had
more trouble than I have ever seen, except for some boats with
folding
props. Is that normal?

I have F-33 # 58. She has an outboard rudder and backs like a charm, as
long as you don’t crowd her she will follow the trailing edge of the
rudder with no problem. Recognise that its a 33 foot boat and
therefore doesn’t have whiplash response.

3

Posted by Jerome Weinraub (zayde@…>)

I have hull 68, 27 hp Yanmar,3 blade 15x13 prop,and she will walk to port
until you get some way on so the rudder can bite. She will not turn easy,due
to hull shape,but she will self steer easily under sail. Maybe the boat was
not at fault
----- Original Message -----
From: “tgcmd” <Finesse@…>
To: <freedomyachts2003@yahoogroups.com>
Sent: Saturday, May 22, 2004 1:23 PM
Subject: [freedomyachts2003] Backing the F-33

\

Can anyone tell me anything about the backing characterists of the
F-33 under power. The boat I am looking at has a fixed, 2-blade prop.
When the owner backed the boat out of the slip for a sea trial, he had
more trouble than I have ever seen, except for some boats with folding
props. Is that normal?

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4

Posted by Frank Minelli (myslo@…>)
I agree with that second advice you have gotten so far. The rudder
will not have any effect until you get some sternway going, more than you ever have coming out of a slip. Therefore, in that situation , the direction of the prop rotation is the only factor (absent any wind and or current) that influences the track, when beginning to make sternway, and that happens to be to port. (on most boats) But it is slight, and should not throw a competent skipper. tgcmd <Finesse@…> wrote:
Can anyone tell me anything about the backing characterists of theF-33 under power. The boat I am looking at has a fixed, 2-blade prop.When the owner backed the boat out of the slip for a sea trial, he hadmore trouble than I have ever seen, except for some boats with foldingprops. Is that normal?
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5

Posted by Larry Powers (lapowers57@…>)

My F33 also has a two bladed prop and my experience has been that backing
out of a slip I can go straight back or to port but due to the prop walk I
can’t back to starboard untill I have a gotten up some speed. Add a strong
breeze that can grab the bow and now you make backing out even more
interesting.

tgcmd <Finesse@…> wrote:
Can anyone tell me anything about the backing characterists of the
F-33 under power. The boat I am looking at has a fixed, 2-blade prop.
When the owner backed the boat out of the slip for a sea trial, he had
more trouble than I have ever seen, except for some boats with folding
props. Is that normal?

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6

Posted by mike_c_f35ck (mike_c_f35ck@…>)

Yes, it’s normal but can be improved.

Reasons why backing is a pain:

  • Stern hung rudder without balance part;
  • prop wash going against the end of the hull;
  • two blade prop with usually to large an angle because of the limits
    in the diameter. This results in the prop working best on higher
    speeds (remember speedboats have props with extreme angles) and
    giving a lot of prop walk on low speeds.

I had a 15x15 fixed two blad on my F33cb and could only back to one
side. I replaced the prop with a 3-bladed Volvo Penta folding prop
(with scythe shaped blades like on tugs and subs)of 17x12. Now it
manoeuvres like a dinghy, both forward and back, even with very low
speeds.

regards,
mike