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post #111 of Old 01-27-2008
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Whe an engine manufacturer does the dynamometer test for a motorcycle, he does not state what size of wheel you have to use with it.

Why do the great Tohatsu not state the engine power against crankshaft rpm? Surely they can find a dynamometer somewhere. That talk about a 2/3 variation in the power output is garbage... notice it is always derated, not uprated. So, a 6 hp motor can drop to 4 hp, but never 8 hp.

They don't have to mention props.

Just publish the power curve.... power with engine rpm.

Chosing the prop would be the owner's problem.

Measuring a bollard pull is not much use. Not too many people tie their boat to the dock, in gear, with the motor running. It frightens the fish.

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