Sikorsky S-61Sikorsky S 61 Helicopter airplane model. In September 1957 the US Navy awarded Sikorsky a development contract to produce an amphibious anti submarine warfare helicopter capable of detecting and attacking submarines. The prototype Sea King flew on March 11 1959, while production deliveries took place from September 1961. Power for initial production aircraft was supplied by two 930kW (1250shp) General Electric T58GE8B turboshafts. Development of a
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