perkins prima m50

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    Propellor, speed

    i have a beneteau Oceanis400 1993 with a Perkins prima 50 and 17in max prop (3 blade feathering). At 2800 rpm, which is high, I can only motor at 5.8knots in flat water. I've adjusted the pitch to the highest recommended by the manufacturer. The engine gets to 2800 easily. Any ideas?
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