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I think its a 20 LH 13 but I’m not sure of the pitch. It is definitely 20
inch diameter and left-handed.Oh, and 3 blades.
Bob
I’m not being short. This is from my mobile.
On Nov 18, 2010 8:36 AM, “emeraldtide” <> wrote:I am in the process of buying a 1979 Pearson with the original Westerbeke
engine. It has a folding prop. We want to replace it with a non-folding
prop. Does anyone know what kind of prop we need to find?
Emerald Tide_______________________________________________
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Emerald Tide,
There’s no absolute guarantee that Pearson used the best propeller for that
engine in that boat. Consider calling a professional prop shop with your
question. They’ll ask you for various measurement numbers and come up with
their recommendation for your boat. Once the prop is on and the boat
launched, you can run some RPM tests – again, a good prop shop can tell you
exactly how to do that – and confirm whether the pitch of the new prop is as
good as it can be, but chances are they’ll get it close enough the first
time around.Tor
SilverHeels, P-424 #17
http://www.silverheels.us
Original Message
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+1 on Tor’s advice – especially since Pearson installed more than one type
of engine and transmission on these boats. For a 1979 boat you could have a
W58 or W60 and a Paragon or Velvet Drive transmission. Also remember, no
matter how many metrics you capture and no matter how detailed the analysis
from the prop shop, propeller sizing is a Black Art requiring incantations
and potions to be accurate. Sacrificing a chicken never hurts. 🙂On Thu, Nov 18, 2010 at 10:07 AM, SilverHeels <> wrote:
Quote:Emerald Tide,There’s no absolute guarantee that Pearson used the best propeller for that
engine in that boat. Consider calling a professional prop shop with your
question. They’ll ask you for various measurement numbers and come up with
their recommendation for your boat. Once the prop is on and the boat
launched, you can run some RPM tests – again, a good prop shop can tell you
exactly how to do that – and confirm whether the pitch of the new prop is
as
good as it can be, but chances are they’ll get it close enough the first
time around.Tor
SilverHeels, P-424 #17
http://www.silverheels.us
Original Message
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check out the campbell sail prop-West by North Enterprises-I replaced a folding
prop with it-it is very efficient,even in reverse-this is the 2nd 42′ sailboat
I’ve used them on.Very smooth,minimal vibration compared to a maxi-prop and less
stress on the transmission.Less drag than a typical 3 blade fixed-designed
specifically [machined] for sailboats.Nice descripton on the website-claim to
have the most efficient 3 blade fixed prop-I love it. They can help you size
one.You can’t use mine as an example since I have a 71 hp westerbeke.
They are normally smaller than a standard 3 blade fixed if sized properly-for
example -I went from a 19″ maxi to a 17″ guessing-maybe 15″ campbell.
You will need a prop lock system-I have one on my to do list-otherwise it can
and will rotate when sailing like any other non-folding prop.________________________________
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Joe Shimkonis
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