Even after the introduction of rescue helicopters such as the Westland Dragonfly in 1953 the RAF continued to operate a fleet of Rescue/Target Towing Launches, the last of which were not retired until 1986.
In December 1946 an agreement was signed between Westland Aircraft and Sikorsky to allow a British version of the S-51 to be manufactured under license in the United Kingdom.
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The Westland WS-51 Dragonfly helicopter was built by Westland Aircraft and was a license-built version of the American Sikorsky S-51.
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