prop size

[leda]

we have recently changed the engines in our boat,and these engines do not produce full revs.can anyone explain how to calculate correct prop size?
any help appreciated!!

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[nordic_ranger]

Hello Leda,

Welcome to the forum.Have a look at this site it has a free prop. calculator, hopefully it can be of some help.

Jim.

http://www.castlemarine.co.uk/pitch.htm

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[steve28]

The aformentioned program should be used as a guide only, if you need to know if your correct speak to either the people who put the engine in or a prop specialist.
Bt Marine in devon are great.


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