Importance

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Abstract

This tunnel-hull uses non-linear flow means to maximize tunnel lift efficiency, fuel economy, and directional stability. The lower lateral hull planing surfaces have sharp, wedge-shaped step discontinuities defining multiple flat, smooth, planing surface sections having zero dead-rise angle. The steps decrease wetted surface area and increase hydrodynamic traction without adding draft. Downwardly extending curved lateral hull portions define a tunnel between their parallel inner edges. Random impressions in the undersurface of the tunnel relieve vacuum suction and create non-linear air flow for greater lift. Downwardly bent front edges of the tunnel and rear delta wing swim platforms are control surfaces that serve as safety brakes and prevent flipping. Tunnel air pressure increases in a gradient from bow to stern placing the center of lift aft of the center of mass, which provides safety from undue inclination and extra shock absorption. The planing surfaces are, alternatively in the form of endless rolling belts, which allow beaching and amphibious operation with high efficiency and without damage to the hull.

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First Claim