The Sikorsky H-19 Chickasaw (company model number S-55) was a multi-purpose helicopter used by the U.S. Army and USAF.
It was also license-built by Westland Aircraft as the Westland Whirlwind in the United Kingdom.
Sikorsky ya fara haɓaka H-19 a cikin sirri ba tare da tallafin gwamnati ba. An fara tsara jirgin helikwafta a matsayin gwajin gwaji don ƙira da ƙima da yawa waɗanda aka yi niyya don samar da mafi girman ƙarfin ɗaukar kaya tare da kulawa mai sauƙi.
The first customer was the USAF, which ordered five YH-19 aircraft for evaluation; the YH-19’s first flight was on 10 November 1949.
This was followed by delivery of the first YH-19 to the USAF on 16 April 1950 and delivery of the first HO4S-1 helicopter to the U.S. Navy on 31 August 1950.