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Westland-Sikorsky WS-51 Mk.1A Civil transport helicopter powered by a 520 hp (388 kW) Alvis Leonides 521/1 radial piston engine, 36 built. Westland-Sikorsky WS-51 Mk.1B Civil transport helicopter powered by a 450 hp (336 kW) Pratt & Whitney R-985 Wasp Junior B4 radial piston engine, 15 built.
The civilian version, under the designation S-51, was the first helicopter to be operated commercially, commencing in 1946. In December 1946, an agreement was signed between the British company Westland Aircraft and Sikorsky to produce a British version of the H-5, to be manufactured under license in Britain as the Westland-Sikorsky WS-51 ...
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.
Westland Wessex a turbine-powered version of the Sikorsky S-58; Westland Whirlwind a license-built version of the U.S. Sikorsky S-55/H-19 Chickasaw with British engines. Westland Widgeon a private venture by Westland Aircraft as an improvement on the Westland WS-51 Dragonfly; Westland Westminster (1958) – heavy lift helicopter, private ...
In 1950, Westland Aircraft, already building the American Sikorsky S-51 under licence as the Westland Dragonfly, purchased the rights to manufacture and sell Sikorsky's larger Sikorsky S-55 helicopter. While a Sikorsky-built pattern aircraft was flown by Westland in June 1951, converting the design to meet British standards (including the ...
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BEA's S-51, G-AJHW, seen at an unspecified location in 1953. Hay Mills Rotor Station (or Rotorstation) was a helidrome in the Hay Mills district of southern Birmingham, England, which was operational from 1951 to 1954.