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My 1999 C90 Yamaha will crank 5500 RPM's at WOT with ease....the book says the gear ratio is 13:26 (2.0)....so how many RPM's is my prop turning at an engine speed of 5500?.....
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the convention is that the ratio is stated as engine/prop
so 2:1 - the engine turns twice for every propeller revolution
5500 engine rpms the prop is turning 2750
which begs another question:
do driveshaft seals typically wear out sooner than propshaft seals?
and if so - is the reason the difference in shaft rpm? -
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Robert you know better, cranking and WOT do not relate to each other
and a lot of prop seals go bad due to fishing line not just wearing out
Robert listed ratio a 1 to 2 and fairdeal listed ratio 2 to 1
seems a little differentLast edited by 99yam40; 07-28-2017, 08:13 AM.Comment
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