A simple means of controlling vertical stability and pitchpole moment in sail-powered hydrofoil craft is described. The system is self-stabilizing, requires no moving parts, and adds no additional operations to normal small-craft sailing technique. The method has been reduced to practice in a full-scale experimental craft, and shows promise of opening the way for development of a family of ultra-high-speed sailboats. Speeds in excess of twice the velocity of the wind are indicated, or roughly double the speeds attained by modern catamarans in like wind conditions.

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