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Westland/Sikorsky WS-51 Prototype. Dragonfly HR.1 Air-sea search and rescue helicopter for the Royal Navy powered by a 540 hp (400 kW) Alvis 50 radial piston engine. 13 built, some modified later as HR.5s.
Production started with the Sikorsky S-51, which became the Westland Dragonfly, flying for the first time in 1948 and entering service with the Royal Navy and Royal Air Force in 1953. Westland developed an improved version, the Widgeon, which was not a great success.
Westland Aircraft decided to make a private venture improvement on the Westland WS-51 Dragonfly helicopter, which was a licensed Sikorsky Aircraft design, by increasing the cabin capacity and replacing the Dragonfly's rotor head, blades and gearbox with the units used in the Westland Whirlwind. Three Dragonfly Series 1As were converted to WS-51 ...
Westland WS-51 Dragonfly. The Westland Wyvern was a post-war design of carrier-based strike-fighter for the Fleet Air Arm serving up to 1958. Post-war the company decided to get out of fixed-wing aircraft and concentrate solely on helicopters under a licensing agreement with Sikorsky.
In Britain, Westland Aircraft began production in 1946 of the Westland-Sikorsky S-51 Dragonfly for the Royal Navy and the Royal Air Force, all of which were powered by a 500 hp Alvis Leonides engine. This gave an improved top speed of 103 mph and a service ceiling of 14,000 ft. In total, 133 Westland-Sikorsky Dragonfly helicopters were built.
Westland WS-51 Dragonfly; X. Boeing X-50 Dragonfly This page was last edited on 23 June 2024, at 16:42 (UTC). Text is available under the Creative Commons ...
Westland WS-51 Dragonfly; Windspire Aeros; Y. Yakovlev EG; Yakovlev Yak-100 This page was last edited on 9 February 2025, at 19:00 (UTC). Text is available ...
The first production use was the Percival Prince, which flew in July 1948 and the Westland Sikorsky S-51 and Westland WS-51 Dragonfly helicopters. From 1959 the stroke was increased to 4.8 inches for the Series 530 (mainly the Mk. 531 for Twin Pioneers ) rated at 640 hp.