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On the left: Surface-piercing hydrofoil. On the right: fully submerged hydrofoil.
Surface-piercing hydrofoil is self-stabilizing: when the hydrofoil gets deeper into the water, more hydrofoil area is under water, lift is increased and the hydrofoil moves upward.
Fully submerged hydrofoil is not self-stabilized. It has no idea where it is with respect to the water surface.
In case this is not legally possible: Peterpan дазваляе кожнаму выкарыстоўваць гэты твор ў любых мэтах, без аніякіх умоваў, калі толькі такія ўмовы не патрабуюцца паводле закону.
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