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Old 18-03-2011, 07:39   #1
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Prop Advice

I have a 34 O'day with a 24hp universal diesel. It is turning a 16x12 two bladed prop. I would like to switch to a three bladed prop before starting a 2000 mile trip. Any advice as to size? I previously owned another 34 O'day which had the three bladed prop and was much happier with the performance. I just don't recall the size!
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Old 18-03-2011, 13:09   #2
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Re: Prop Advice

Following sites allow you to "game" your prop size to calculate the effects on hp required vs speed. You need a good guessestimate on your displacement( weight) and your waterline length

http://www.psychosnail.com/BoatSpeedCalculator.aspx

Propeller Calculator / Prop Calculator
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Old 19-03-2011, 09:24   #3
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Re: Prop Advice

Thanks, I was aware of how to calculate the various parameters posted in these links. I was hoping for some empirical data, perhaps someone that has a three bladed prop on a 12000#, 34', roughly 25 hp vessel. Thanks again for your post.
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