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Re: Aluminium Boat Hulls, Small Inboards.... advice?

The use of small, air-cooled inboard motors for non-planing boats used to be pretty common. Cooling isn't really a problem, but you have to leave the motor pretty much uncovered, which is noisy.

For slow speeds, the 12 hp you mention should be plenty to drive a hull in the size range you mention. But you'll have to figure a gearing and propeller size to fit the hull that you find.

As far as the hull goes, I would look for something relatively long and narrow. Also, the bottom could be somewhat rockered, showing curvature longitudinally. These features are best for efficient slow-speed travel. That won't be a very common animal in aluminum.

Have you considered building a hull yourself, either of aluminum or out of plywood? You said you wanted a project!

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