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  Tradeoff between Propeller Pitch and Diameter

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Author Topic:   Tradeoff between Propeller Pitch and Diameter
whalersailer posted 05-21-2003 01:42 PM ET (US)   Profile for whalersailer   Send Email to whalersailer  
I'm having a tough time locating a used 13.25 x 19 prop for my [15-foot Boston Whaler boat]. What is the tradeoff between diameter and pitch? I have found several 12.75 x 21 props for reasonable amounts of money, but I'm not sure how the performance might be with a smaller diameter and larger pitch. Any thoughts? Thanks,

-WS

bsmotril posted 05-21-2003 02:37 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Going down in diameter will raise the rpm slightly, maybe increase the slip factor with a heavy boat. For a light to moderate load, it will usually bump up the top speed an mph or two. For the size difference you are contemplating, rpm difference should be slight.
BillS

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