Re: [electricboats] How do I power my little launch?

We like to think of boats as either displacement (goes *through* the water) or planing (gets up *on* the water), but it is actually a continuum of displacement<->semi-planing<->planing.

With a true displacement hull you can easily calculate how much force you need; more will do you no good. With semi-displacement to displacement things get a lot more fuzzy. Because your boat is a scale model of a displacement boat, but dramatically lighter comparatively due to your method of construction, I would guess the boat will be mostly displacement.

In that case, calculate how much power you need based on the top speed, displacement (remember to include a fudge factor for crew/passengers, battery, and motor mass), and length water line. There are many such calculators online. That will give you an idea, probably in brake horsepower, of how much motor you need, what model of prop will be efficient, etc.

Amgine

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