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Old 22-09-2010, 04:01   #1
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Most Efficent Low-Speed Hull

My question is, what is the most efficient hull shape for low speed use. Around 5 knots.

I am aiming for a sub 6m length. As little draught as possible.
For use on very protected waters only. No wave handling is really needed.
Total weight around 1000KG. Ideally a multi-hull for wide tramp decks.

The idea is to use electric propulsion and a crab claw sail for downwind work. Plus a backup outboard shared with the dinghy!


I have done a lot of reading into hull efficiencies with different shapes but not a lot seems to deal with low speeds.
So, does anyone know what hull shape is most efficient at low speeds? I know any skinny long hull is pretty good, but there seems to be a lot of opinion on entry and exit shapes etc.
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Old 22-09-2010, 05:59   #2
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You might consider posting your question over there:

Boat Design Forum

As they do specialize in boat design
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Old 22-09-2010, 06:12   #3
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Thanks, that's a good idea!
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Old 22-09-2010, 09:09   #4
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Quote:
Originally Posted by handmer View Post
My question is, what is the most efficient hull shape for low speed use. Around 5 knots.

I am aiming for a sub 6m length. As little draught as possible.
For use on very protected waters only. No wave handling is really needed.
Total weight around 1000KG. Ideally a multi-hull for wide tramp decks.

The idea is to use electric propulsion and a crab claw sail for downwind work. Plus a backup outboard shared with the dinghy!
I think you'll find a pontoon boat is about what you are looking for given the mix of weight, draught, speed. Here are two, a run of the mill pontoon boat and, in the thumbnail, a Gougemaran (source website but you can find two in the 5th edition of the Gougeon Bros on Boat Building). Read the caption under the latter if you will.

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