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| First flown in 1947, the Sikorsky S-52 was the first helicopter in the United States fitted with metal rotor blades constructed of aluminum and steel. A two-seat aircraft, it established international speed and altitude records for rotary-wing aircraft, attracting the interest of the military. Modified for military use with a more powerful engine and accommodations for two pilots and three passengers or a pilot and two litters, the HO5S first flew in August 1951 and within a year was serving with the Marines over Korea, where it operated as a scout and observation helicopter and logged day and night medical evacuation of personnel. HO5S-1s also served with the Navy and Coast Guard, though limited range and lack of lifting capability translated into a relatively short period of service. The U.S. Air Force employed the aircraft under the designation YH-18.
SPECIFICATIONS: Manufacturer: Sikorsky Aircraft Division of United Aircraft Corporation Dimensions: Length: 27 ft., 5 in.; Height: 8 ft., 8 in.; Rotor Diameter: 33 ft. Weights: Empty: 2,570 lb.; Gross: 2,769 lb. Power Plant: One 245 horsepower Franklin O-425-1 engine Performance: Maximum Speed: 110 M.P.H.; Service Ceiling: 12,400 ft.; Range: 165 miles Armament: None Crew: Two pilots and three passengers |
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| Bibliography: National Museum of Naval Aviation |