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  prop size for 64-13ft.

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Author Topic:   prop size for 64-13ft.
Westerly posted 07-05-2004 09:29 PM ET (US)   Profile for Westerly   Send Email to Westerly  
I have a 64-13 b.w, it has a 95 40hp 20inch merc. The motor came with a ss prop. I have trouble pulling my teenagers skiing and tubing. I do not know the prop size ,I put a jackplate on it and the boat runs with a flat type attitiude.(plowing bow) Any help with prop size and any mods would be greatly appreicated. Thanks, rob
Westerly posted 07-07-2004 10:04 PM ET (US)     Profile for Westerly  Send Email to Westerly     
jimh posted 07-07-2004 11:06 PM ET (US)     Profile for jimh  Send Email to jimh     
To assess propeller performance, the following information must be known:

--Engine Speed
--Lower Unit gear ratio
--Propeller Pitch
--Boat Speed

Engine speed is measured by a Tachometer.

Boat speed is best measured by a GPS with DGPS or WAAS enhancement.

Take all measurements in water without current effects, in low wave conditions, and in very low winds.

Provide a table of information of engine speed versus boat speed for several speeds, including wide open throttle.

Provide the details of your current propeller pitch, diameter, blade type, and composition, and current engine maximum RPM and lower unit gear ratio.

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