Posted by lance_ryley (lance_ryley@…>)
I just finished a haulout in Winthrop MA to do a little epoxy work
and paint the bottom. It’s a testament to the previous owner of
Bright Star that the bottom looked pretty fantastic after a power
wash. The only area that was a concern was the propeller! It had
barnacle growth on both sides of both blades.
I had realized on the honeymoon cruise that something wasn’t right,
because at 3,000 rpm I could only push the old girl at about 4.5
knots. 3,500, which I hate going to, didn’t even add half a knot to
that. I of course assumed the worst - galvanic corrosion of the
prop, a missing blade, a giant bucket tied around the rudder post…
but in truth, it was all about the extra cavitation created by the
barnacles.
I relaunched last night and brought the boat back to Charlestown. at
2,000 rpm, the boat reached 5 kts, at 2,900 (my favorite cruising
revs) 6 kts, and at 3,500 7 kts. I know this last speed because I
used it to clear Logan’s active runway. I know, logically, that they
must be approaching at a higher altitude than it looks, but it is
extremely disconcerting to be in the channel, well outside the
standoff bouys, and still feel hot, 25 mph jetwash gusts when they
are landing.
In any case, Bright Star feels like a new boat with a new prop now.
Just in time for my trip to Maine!
Cheers,
Lance
Posted by Richard Fontaine (rafontaine1@…>)
Lance:
What size prop have you installed? I have a 17R10 2 blade and have not come close to 3500rpms.
Rich Fontaine
F36, Libertelance_ryley <lance_ryley@…> wrote:
I just finished a haulout in Winthrop MA to do a little epoxy work and paint the bottom. It’s a testament to the previous owner of Bright Star that the bottom looked pretty fantastic after a power wash. The only area that was a concern was the propeller! It had barnacle growth on both sides of both blades.I had realized on the honeymoon cruise that something wasn’t right, because at 3,000 rpm I could only push the old girl at about 4.5 knots. 3,500, which I hate going to, didn’t even add half a knot to that. I of course assumed the worst - galvanic corrosion of the prop, a missing blade, a giant bucket tied around the rudder post… but in truth, it was all about the extra cavitation created by the barnacles.I relaunched last night and brought the boat back to Charlestown. at 2,000 rpm, the boat reached 5 kts, at 2,900
(my favorite cruising revs) 6 kts, and at 3,500 7 kts. I know this last speed because I used it to clear Logan’s active runway. I know, logically, that they must be approaching at a higher altitude than it looks, but it is extremely disconcerting to be in the channel, well outside the standoff bouys, and still feel hot, 25 mph jetwash gusts when they are landing.In any case, Bright Star feels like a new boat with a new prop now. Just in time for my trip to Maine!Cheers,Lance
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