Rob, I have read somewhere that cats and tris aim for a minimum of 8:1 to prevent stern squatting in the manner of a mono-hull. For the ww hull an 8:1 would have lower surface area for a given displacement than an 11:1 so less resistance at low speeds. At higher speeds some of the displacement of the ww hull would be carried by the lw hull and therefore the greater wave making resistance of 8:1 would be less of a factor. Are there other more important considerations such as drag on the steering?
Longer and skinnier is still better for speed probably.
>
> The longer and skinnier the better, but as long as it does not drop
> below 11:1 l:b, you will be fine.
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