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Old 03-03-2013, 07:11 PM   #77
rwidman
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City: North Charleston, SC
Join Date: Sep 2010
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Quote:
Originally Posted by Daddyo View Post
The props I'm currently running are 24x22 4 blades. My spares are 25x20 4 blade. We make 6.8knts at 1400rpm with the 24s. I would prefer to run the larger flat 25s. My question is for you prop calculator types, what would my speed most likely be at the same 1400rpm with the 25s? How much more efficient would they be? Is this even reasonably calculable?
People can guess and argue who is the most qualified to guess, but if you really want to know how these props will perform on your boat, the most reliable way to find out is to do some testing with the current props, switch to the new ones and repat the testing under the same conditions.
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