The Sikorsky Aircraft Division of United Aircraft Corp. last week unveiled the world's first commercial helicopter, an adaptation of Sikorsky's war-tested ship. The new model S-51 will cruise at 80 miles an hour, have a range of 150 miles with full load of pilot, three passengers, 70 pounds of baggage. But those who have blissfully dreamed of a helicopter in every garage were dismayed at the price: almost $50,000.
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