There is also a difference in how motors were traditionally labeled.
While measuring horsepower was basically the same between internal combustion and electric motors, there was a difference in what was reported.
ICE motors were typically rated at the maximum horsepower that could be produced for 15 minutes without overheating. (That means at 16 minutes the alarms are ringing and the needle is over in the red.) Continuous HP was rarely reported. And a few things like alternators were sometimes left out of the test.
Electric motors are typically rated for continuous horsepower - since they were used to run machinery that was expected to run all day.
And besides, horsepower - the American male's obsession notwithstanding - is almost beside the point. The important number is torque, and specifically torque at low RPM in the case of boating.
--- In electricboats@yahoogroups.com, "roger_russelburg" <rrusselburg@...> wrote:
>
> Hi
>
> I am new to this group.
> My sailboat works fine with 6hp outboard.
> Is there direct relationship (6hp = 4750w) or is eletric power
> more efficient?
>
>
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