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You don't have to go through a series of props. This question of which prop to use on an F70 mounted on a 17 foot Whaler hull has been addressed many times on this forum. It was mentioned above that Tom Clark reccomended a Yamaha Performance Series 13.25 x 14 prop for another members 17 footer with the F70 engine. You won't find another person on this site more knowledgable about props than Tom. That's the advice I would follow.