Aircraft Data Sheet: WS-55 Whirlwind (1952)
|First flight:||12th November 1952|
|Rotor diameter:||16.15m/53ft 0ins|
|Max weight:||3,402kg/ 7,500lb|
Pratt & Whitney Wasp R-1340-40(600hp)
or One 750shp/559kW
Wright Cyclone R-1300-3
|Accommodation:||Two pilots plus ten|
After the Dragonflies had entered service, Westland announced the agreement
between Sikorsky had been finalised to build Sikorsky S-55 for the British
Forces, the Westland built a version of the Sikorsky S-55 was used for Search
and Rescue, Transport and Anti-submarine duties. Initial versions designated
Series 1, followed closely the engineering of the US original, and were powered
by the 600hp/447kW Pratt and Whitney engine.
Later, 750hp/559kW (de-rated) Alvis Leonides Major engines was fitted producing a Series 2 of improved performance. Whirlwinds were supplied to the RAF to operate in the Rescue and Transport roles. The Royal Navy used the aircraft for SAR and anti-submarine duties. Two Whirlwind HCC Mk8 aircraft were used by The Queens Flight.