Harrier Jump Jet two systems are fully interlinked but air is not supplied to the reaction control valves during conventional wingborne flight. Harrier Jump Jet The Harrier, informally referred to as the Harrier Jump Jet, is a family of jet-powered attack aircraft capable of vertical/short takeoff and landing operations (V/STOL). Named after a bird of prey, it was originally developed by British manufacturer Hawker Siddeley in the 1960s. The Harrier emerged as the only truly successful V/STOL design of the many attempted during that era, despite being a subsonic aircraft, unlike most of its competitors. It was conceived to operate from improvised bases,
BAC Jet Provost the addition of a dorsal fillet; the new model was designated as the "Jet Provost T2". On 1 September 1955, the first Jet Provost T2 made its first flight. This variant was used only for development work; in addition to seeing use at Hullavington, three Jet Provost T2s were dispatched overseas for winterization trials in Scandinavia and a series of sales tours across Europe, Canada, the United States of America, and Latin America. In June 1957, a production order was placed for the first 40 of the developed "Jet Provost T3", featuring a more powerful Armstrong Siddeley Viper jet engine,