Boat speed under motor

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Jul 15, 2010
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Catalina Catalina 32 1997 CYC Adelaide Australia
Sitting on 2200rpm Im getting about 4.2 knots out of my Yanmar 29 on the Catalina 32. If I crank it up a bit I get very little extra. How does this rate? I understand the pitch of the prop is the first issue that should be addressed. Any thoughts?
 
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