ġ,281 of the helicopters were manufactured by Sikorsky in the United States. Marine Corps, and on, the first S-55 was delivered to Westland Aircraft. On 27 April 1951, the first HRS-1 was delivered to the U.S. Air Force YH-19 was sent to Korea for service trials in March 1951, where it was joined by a second YH-19 in September 1951. Air Force on 16 April 1950 and delivery of the first HO4S-1 helicopter to the U. This was followed by delivery of the first YH-19 to the U.S. The first customer was the United States Air Force, which ordered five YH-19 aircraft for evaluation the YH-19's first flight was on 10 November 1949, less than a year after the program start date. Katzenberger, a mockup was designed and fabricated in less than one year. Under the leadership of designer Edward F. The helicopter was initially designed as a testbed for several novel design concepts intended to provide greater load-carrying ability in combination with easy maintenance. Air Force counterparts.ĭevelopment of the H-19 was initiated privately by Sikorsky without government sponsorship. Marine Corps versions were all redesignated as H-19s like their U.S. United States Navy and United States Coast Guard models were designated HO4S, while those of the U.S. It was also license-built by Westland Aircraft as the Westland Whirlwind in the United Kingdom. The Sikorsky H-19 Chickasaw (company model number S-55) is a multi-purpose helicopter that was used by the United States Army and United States Air Force.
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