Design and Development
An American-built Sikorsky HSS-1 was shipped to Westland in 1956 to act as a pattern aircraft. It was re-engined with a Napier Gazelle turboshaft engine, and first flew in that configuration on 17 May 1957. The first Westland-built Wessex XL727, designated a Wessex HAS.1, first flew on 20 June 1958, and they entered anti-submarine duties in 1961 with the Royal Navy Fleet Air Arm. The Royal Navy's anti-submarine examples (HAS.1, HAS.3) also used the Gazelle engine.
The design was adapted in the early 1960s for the RAF, and later Royal Marines, to become a general-purpose helicopter capable of troop-carrying, air ambulance and ground support roles. In contrast with the HAS.1, it used twin Rolls-Royce Gnome engines. These marks (HC.2, HCC.4, HU.5) had a single large exhaust on each side of the nose, the Gazelle-powered examples having a pair of smaller exhausts on either side.
Read more about this topic: Westland Wessex
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