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.
Idagbasoke ti H-19 ti bẹrẹ ni ikọkọ nipasẹ Sikorsky laisi igbowo ijọba. A ṣe apẹrẹ ọkọ ofurufu ni ibẹrẹ bi ibi idanwo fun ọpọlọpọ awọn imọran apẹrẹ aramada ti a pinnu lati pese agbara gbigbe ẹru nla ni apapọ pẹlu itọju irọrun.
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.