Originally Posted by aquavitae
Has anyone tried a Urethane Extendo 2 blade
fixed prop ?
I have a 1982 sea runner trimaran
37 ft , with 27 hp Yanmar engine
. It spins a 13 inch prop on a 1 inch shaft (2.62 ratio) and I can only get 4.5 to 5 knots out of her. Prop is bronze, 3 blade
, fixed. I am told the problem is the prop size.
I bought a 16 x12 two bladed Extendo prop that will ( hopefully) fit on the existing shaft and still give enough clearance from the hull
by extending the prop 6 inches further aft. Prop is made of urethane and looks pretty stout. Manufactured by Performance Propellers of Homer, NY
Any experience and feedback with this prop- good, bad or indifferent is greatly appreciated
I put one on my boat last fall. It doesn't seem to grow sea critters quickly, and it seems to have a lot of power: I only have a 20 hp engine (new), and if there's no current
on my nose, my boat moves at 6.5 KNOTS (not mph) -- and that's not at redline. Redline on my engine is 3600 and I have gotten up to 6.5 at 3200.
Someone suggested to me that it might be more likely to break if it hit some obstacle in the water
. That may be true, but the company replaces the propeller
in that case AND you can limp back into a port with one blade safely because it's so lightweight.
They claimed improved steering
performance in reverse but I haven't noticed that particularly.
I'm very happy with it.