Operational Requirement F.155 was a specification issued by the British Ministry of Supply on 15 January 1955 for an interceptor aircraft to defend the United Kingdom from Soviet high-flying nuclear-armed supersonic bombers.
Gloster Javelin all-weather fighter in service at the time.
A projected fighter derivative of Fairey's successful FD2 experimental aircraft
Armstrong-Whitworth AW.169 manufacturer's model
Vickers Type 559
Droop nose (aeronautics)
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The droop nose is a feature fitted to a small number of aircraft types so the nose of the aircraft can be lowered during takeoff and landing to improve the pilot's view of the ground below. This feature is used with a very-low aspect ratio wing such as a delta wing. It is installed in aircraft capable of supersonic speeds but is lowered only during low-speed operation such as takeoff and landing.
The Fairey Delta 2 high-speed experimental aircraft, which had a droop nose that included its cockpit
Concorde prototype just prior to landing; note the droop nose
British Airways Concorde in Singapore Airlines livery at Heathrow Airport; note the raised nose
A front-on view of the Tupolev Tu-144 on the ground. Note the deployed retractable canards and lowered droop nose