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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