The hull is clean and so is the prop... so the prop is mismatched and you're not able to get anywhere near what the WOT RPMs should be... I'd say you're over-pitched by about THREE inches, since each inch will drop or raise the RPMs about 200 RPM.
That would bring you up to 2600 RPM WOT... which is not bad for an engine that has a redline of 2800 RPM.
This would bring your cruising RPM up to about 2200 RPM, as suggested by Maine Sail. This should also lower your speed when idling.
The hull is clean and the prop was checked and cleaned 1 hour before the trip started. WOT in gear produces 2000 rpm, out of gear 2500+ rpm. She also runs about 3 mph at idle. the prop is large and 3 bladed. Large meaning just fits in the space within the full keel.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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