Re: Performance numbers
2000 Yamadog F100: 2.31:1 gear ratio, Max of max rpm is 6000.
Assuming you're getting a true 100 hp, then you probably need a 13.75"D x 19"P, or a 13.5"D x 17"P to be able to turn 6000 rpms fully loaded (or close to it). You should have a top speed in the 32-35 mph range. I would try to start with a 19"P prop.
Rremember: More pitch = less rpms. You could get by with a 13.25"x20"P or maybe even a 13.25"x21"P, but the Yamaha F100 is NOT known to be a torquey motor.
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Fr. Frank says:
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Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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