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I have a gheenoe 15 4 with a 1978 johnson 9.9 that has been correctly converted to a 15hp. loaded the boat runs at wot 21mph at 5850 rpm on stock 9.5x10 prop.  With a second person on board I drop about 150rpm and 2mph.  Would I see any advantage in a new prop such as a solas 9.25x9?  The upper operating level is 6500rpm for the 15hp gear ratio 1:2.416.
 
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