I need to know what the pitch would be for a 70;s 50 hp mercury motor used on a pontoon boat?
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This is an 11 spline prop and will be used as a spare. I would like to know what the pitch should be. The boat runs about 20 mph with the one on it, but I have no idea what the pitch is.
they are usually wide diameter and relatively low pitch. it might be tough to find one for an older motor. try 12 1/2″ X 10 or 11″. if it’s a 24′ or longer pontoon try a 9″ pitch.
3 Responses to “I need to know what the pitch would be for a 70;s 50 hp mercury motor used on a pontoon boat?”
Any Propellor shop can tell you the pitch the spare is. I would think 14pitch would be good. You need power not speed. The higher the pitch, the more speed. The lesser pitch, the more power.
References :
I know the standardprop for a yamaha 50 hp outboard engine has :
ne revolution=themovement of the prop's center moves 13 inch forward.
pitch 13 and diameter of prop is 11.
Pitch 13 means
If the pontoon is heavy you could choose a smaller pitch(e.g.12")so you do not have to force the engine.You would lose speed and gain acceleration.
References :
I use to run a waterski buiseness.
to spare the ( 50 hp Yamaha outboard),I gave in on speed and gained acceleration.
they are usually wide diameter and relatively low pitch. it might be tough to find one for an older motor. try 12 1/2" X 10 or 11". if it's a 24' or longer pontoon try a 9" pitch.
References :