> What is the rationale behind having two unequal length hulls on an HP.

So two hulls, the one to leeward takes all the pressure, to windward the weight.

Leeward is long and narrow enhancing the speed length ratio, the pressure on the rig pushes the hull for drive but also rotates around the hull to leeward. Meanwhile the windward on rotation of the leeward is lifted somewhat out of the water to reduce drag.

Alternatives: If you had equal length hulls it would be largely be wasted on the partially lifted leeward hull, and the extra length would add to weight consuming stores weight. On the other hand if you reduce the leeward hull length it was crush its speed length advantage.

At the end of the day a proa is an optimised catamaran, that has the disadvantage of always having to have the wind on one side if speed/performance and reduced drag is the major consideration.

So my question is, why would you want to de-optimise back to a catamaran?

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