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Propeller sizing


I have a 1988 3227 Convertible. Based on the documents I've been able to find it originally came with a pair of Crusader motors with Walter V drives that are geared at 2.05:1. It also has the original 18 X 21 3 blade props. A previous owner repowered it with a pair of Perkins T6.354's and she is at best able to cruise only at about 9-10 knots. I suspect that I need to reprop the boat to match the engines. Does anyone here have any idea where I could find out what type of prop I should have on this setup?

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