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.
Zhvillimi i H-19 u iniciua privatisht nga Sikorsky pa sponsorizimin e qeverisë. Helikopteri fillimisht u projektua si një shtrat testimi për disa koncepte të reja të projektimit të synuara për të ofruar aftësi më të madhe të mbajtjes së ngarkesës në kombinim me mirëmbajtjen e lehtë.
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.