Which prop should I use?

tunabomber

Recruit
Joined
Jun 3, 2009
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2
21' 1988 Seaswirl Sable, it has the model 800 5.0 L OMC Cobra outdrive on it.
15x17 prop only spins at 3150 rpm for 22 kts. Shouldn't I get more rpm out of the engine? Any suggestions?
 
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