The Hawker Siddeley Harrier astounded the world with its unique ability to take-off and land vertically utilizing vectored thrust from its powerful 8000kg thrust engine. First tested in concept in 1960, the aircraft went through many periods of testing and modification prior to acceptance by the Royal Air Force and other nations in 1974. The production Harriers utilized either a Pegasus 6 or 11 engine of 8000 or 9750kg thrust and it was only natural that the Royal Navy should find application for this type of aircraft with their fleet air arm. Various political and financial considerations delayed the order for the "Navalized" Harrier until May 1975, when the Admiralty ordered an initial 24 aircraft plus one T.Mk.4's in 1980.
