Science: Over Land or Sea

Airplanes are fast, but they use a lot of power to keep a payload in the air. Surface ships carry a lot of cargo, but water resistance keeps them slow. Last week Britain's Saunders-Roe, Ltd. (aircraft) demonstrated a hybrid craft that is neither ship nor airplane, but has some of the advantages of both. Called the Hovercraft, it moves a little way above the surface of land or water, supported on a nearly frictionless cushion of air.

Saunders-Roe's Hovercraft has a 30-ft. oval hull like an inverted platter. Sticking up from the center is a cylindrical housing for a 435-h.p. engine and...

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