Subsequently a much larger tandem-rotor helicopter, the Type 173, was developed. From it the Type 192 (named after the Belvedere Palace in Vienna adjacent to Hafner’s childhood home) saw service in RAF squadrons in Britain and overseas. Hafner was more interested in civil rather than the military applications of helicopters. His long-term goal was for acceptance of the convertible rotor concept. One helicopter developed at Bristol was the tandem-rotor Type 194, designed to carry 52 passengers. Work on this ended when all British helicopter activities were consolidated under Westland Aircraft in 1960. Hafner was appointed technical director, holding this position until his retirement in 1970. He continued as a consultatant. During his decade with Westland he propounded his convertible rotor concepts to increase helicopter range and speed by tilting its rotors for forward flight. He presented several papers to the Royal Aeronautical Society, and when in 1977 he was interviewed by its journal ‘Aerospace’ and asked about his interests outside aviation he remarked that he had "taken a great interest in sailing". He applied his knowledge of aerodynamics to sailing ship design. Personal In 1936 Hafner married Eileen McAdam of the macadam road-building family descended from John Loudon McAdam. They had one daughter, actress Ingrid Hafner. He later died as a result of a yachting accident. Notes References External links 1905 births 1980 deaths Austrian aerospace engineers Austrian emigrants to the United Kingdom British aerospace engineers Fellows of the Royal Aeronautical Society Engineers from Vienna