Science: Setback

Helicopters, often touted as the best hope of timid commuters, had a bad fortnight. Three of the windmill aircraft cracked up like any common airplane. A Bell helicopter broke up in the air and fell into Lake Union in Seattle, killing the pilot and a Civil Aeronautics Administration man. Two days later, Coast Guard Pilot David Gershowitz was showing off his Sikorsky HO51 before 250 high-school kids at Floyd Bennett Field, New York, when he swooped too low, pulled up too quickly. The tail rotor hit the ground and broke off. The helicopter...

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