Re: Thrust vs Horepower


[Bulletin Board]


Posted by GES on 2006-07-14 12:02:17 in reply to Re: Thrust vs Horepower posted by Mike McGuire on 2006-07-06 22:07:38

Mike,

30 MPH is 44 ft/sec, so 10 ft per sec is about 6.8 mph.

But there is an assumption that the electric generates 55# of thrust while the boat is doing 10 feet per second, and it probvably does not do that. The 55# is most likely a clamped motor rating, and as the boat gets moving, and the motor RPMs go up the Amps will drop and so will the thrust.

That one HP at 55# thrust would need at least 63 Amps at 12 Volts, or 32 Amps at 24 Volts. And by then you are way over the weight of a 4 hp gas motor I would think.

George


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