For efficient hulls, look to high performance human-powered craft. For example, 
some of the same people behind human powered flight had a project for a human 
powered hydrofoil. I believe it was called the flying fish. I first read of it 
in Scientific American.

>From memory, it reached speeds of over 20 knots with a single person 
>pedalling. Even if that was an Olympic class athlete, that is no more than low 
>single digits for horsepower.

I've recently started looking into this again for one of my next boat builds, 
not least because of my realisation that it could be a nearly perfect solution 
to high performance, long range, long duration electric watercraft. And with 
pedals in the mix, getting stranded without a charge is much less of an issue.
-- 
Ron

On June 29, 2019 9:18:49 p.m. CST, Lawrence Rhodes via EV <ev@lists.evdl.org> 
wrote:
>I am not sure if your hull was designed to plane but if you force 10
>mph you are wasting energy. All your pontoons are good for is around
>7mph. I suspect you may double your range at lower speed.  Lawrence
>Rhodes
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