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itary applications. Over 1750 S-55s were produced by Sikorsky Aircraft or under license in England, France and Japan. The S-58 was an improved ver- sion of the S-55 which first flew in 1954 and boosted a 1,525 horsepower Wright engine. Known in the U.S. military as the venerable H-34, the S-58 had a production run lasting for twenty-five years with over 2,300 aircraft being built. Later model S-58s featured two General Electric T-58 turbines and many early S-58s underwent a turbine conversion resulting in a power increase to 1,800 horsepower and the new desig- nation S-58T.


After steadily guiding the Sikorsky


Aircraft Company and firmly establish- ing it as a leader in the helicopter indus- try, Igor Sikorsky retired as engineering manager for Sikorsky Aircraft in 1957. Even after retiring, Sikorsky was never far from the cutting edge of helicopter development and remained active in the company as a consultant. Igor Sikorsky was involved in the development of the S-61, a revolutionary twin turbine pow- ered amphibious helicopter which first flew in 1959. S-61s, or the military ver- sion the H-3, became known as such versatile and dependable helicopters they were built under license in several foreign countries. Over fifty years after this design first flew, S-61s are still in service today, including being used by Marine Helicopter Squadron One (HMX-1) as the President’s helicopter,


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