Are surfboards planing hulls or displacement hulls?

Question

I am building a boat which is basically a platform on two surfboards with an outboard motor. I plan to put about 5 horsepower on that, and there will be no additional weight.

If surfboards plane, I reckon this will do 15 knots.

If they don't though, I wouldn't really be able to exceed hull speed, would I, and that would be pretty slow in this case.

So, what are they then?

Thanks.

Answer 1

A planeing hull rides on the water. A displacement hull sinks into the water, hence the name displacement hull. Your new water toy will be a planeing hull. Good Luck, sounds like a cool idea.

Answer 2

Planing hull -- flat bottom, no keel -- should plane unless you put too much weight on it.