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07-18-2007 | 02:04 PM

#1

Gryohead

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From: Rayland, OH

engine rpm

I have a dual ring 31cc Ryobi that is turning a Master airscrew 18x8 at 8400 rpm which I think is a little high for this engine, I would like to get this in the 7500 rpm range, should I go with a 18x10 or a 20x6 prop? Gryohead.

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