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Re: FOUR STROKE 150 HP DATA
17 pitch prop @ 4600 rpm
(with a 2.0 gear ratio) http://www.yamaha-motor.com/products...cat=High+Power average prop slip 6 - 10% gives you a theoretical speed of around 33 - 35 mph. prop calculator http://continuouswave.com/cgi-bin/propcalc.pl Prop could be cupped, underrated, or modified to give you a higher pitch which would account for additional speed.
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1971 222 Hiliner 1973 23 Seacraft Center Console 1973 23 Seacraft Sceptre 1971 25 Seacraft Seafari 1972 28 Cary 
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