The Westland Wessex is a British turbine-powered version of the Sikorsky S-58 "Choctaw", developed under license by Westland Aircraft (later Westland Helicopters), initially for the Royal Navy, and later for the Royal Air Force (RAF). The Wessex was built at Westland's factory at Yeovil in Somerset.
Read more about Westland Wessex: Design and Development, Operational History, Variants, Notable Accidents, Specifications (Wessex HC.2)