This image shows how the lever arm of righting moment due to hiking increases as the heel angle increases. The skipper can either be at the outer edge of the windward hull or out at the edge of the planing hydrofoil. The attack angle of the planing hydrofoil is assumed to be 6º. Note that the anti-heeling lever arm doubles as the heeling angle ioncrease from 0ºto 40º if the skipper is on the gunwale. That is equivalent to the skipper doubling his/her weight on an ordinary boat. If the skipper moves out at the edge of the planing hydrofoil, the lever arm (or apparent weight of the skipper) almost tripled. Thus at winds up to those resulting in a 40º heel angle, the boat is extremely stable.
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