I don't think that anyone here has said that an electric power boat can't be done. Your link shows a great example of an effective solution. Starting from scratch with an very efficient hull design made it possible. But that is a far cry from the conversion that was being discussed here. Starting with a boat that was designed for 500hp changes the problem quite a bit. Given the specific donor boat and the stated operational parameters, pure electric may not be feasible. It's kind of like entering an efficiency challenge with a box truck; the smaller, lighter vehicles will win every time.
Electric drive is a great solution, given the right platform and usage. But there is a reason that ICE vehicles and vessels have dominated the transportation world for so long. My 30' ketch and dinghy are electric, I chose not to convert my 27' racing trimaran on purpose. For that boat, a 9.8hp outboard is lightweight, simple, powerful, cheap and has a motoring range of more than 100 miles @ 7 kts for the all up drive weight, including fuel, that is less than three group 27 batteries. Different answers for different problems.
Fair winds,
Eric
marina del Rey, CA
--- In electricboats@yahoogroups.com, "hob t" <marlborosounds@...> wrote:
>
> Here is a link to a solar boat that crossed the Atlantic a few years ago with nothing but solar and electric 8kw motors. 12tons and 520ah of batteries. Why people wish to limit what can be done and cant be done. I guess there is a first time for everything and always someone to show the masses that hey it can be done.
>
> http://www.transatlantic21.org/
>
> Cheers
> sv/qwave
> the other electric boat
>
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