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| Afterplane |
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The surface bottom behind the break; or the section of the main hull behind the sponsons.
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| Air Dam |
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A device in the tunnel beneath the bow or the leading edge of a three-point hydroplane that creates turbulence under the boat, reducing lift.
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| Air Trap |
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A tunnel created by the inner vertical walls of the sponsons, which channels high-pressure air that's forced underneath by the boat's forward motion.
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| Angle of Attack |
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The angle between the sponson's planing surface and the surface of the water.
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