Special forces gunship 1957-19591/2/2024 ![]() The Sioux is a three-seat observation and basic training helicopter. The first Westland Sioux made its maiden flight on 9 March 1965. The first 50 helicopters of the contract were built by Agusta at Gallarate in Italy followed by 150 built by Westland at Yeovil. the first contract was for 200 helicopters. competitor's aircraft, Westland licensed the Model 47 from Agusta, who had purchased a license from Bell. In order to comply with the terms of its licence agreement with Sikorsky Aircraft, which prevented it building a U.S. The Bell 47 was ordered by the British Army as the Sioux to meet specification H.240, with licensed production by Westland Helicopters. It was also used as an observation helicopter early in the Vietnam War, before being replaced by the Hughes OH-6 Cayuse in 1966. During the war it was used in a wide variety of roles including observation, reconnaissance, and medivac. Army during the Korean War, with the H-13D variant being the most prevalent. ![]() The H-13 was one of the principal helicopters used by the U.S. The Coast Guard procured two of Bell's Model 47G and designated them HUL-1G in 1959. Coast Guard procured three HTL-5s in 1952 (similar to the HTL-4 but powered by a Franklin O-335-5 engine) and used these until 1960. Navy version of the 47 was designated the HTL-4, and dispenses with the fabric covering on the tail boom. The United States Coast Guard evaluated this model, and procured two HTL-1s for multi-mission support in the New York Harbor. Initially, the United States Navy procured several Bell 47s, designated HTL-1, between 19. These would later receive the name Sioux. The United States Army first ordered Bell 47s in 1948 under the designation H-13. Most were designated YR-13 and three winterized versions were designated YR-13A. ![]() ![]() In 1947, the United States Army Air Forces (later the United States Air Force) ordered the improved Bell Model 47A. ![]() This section needs expansion with: Fill in some details on early development. ![]()
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