No longer in production, 289 were built

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.

Courtsey of AgustaWestland