UK2 XF923 Bristol 188 1962-04-03 Filton BAeColl.jpg (1024×688) Bristol 188 (1962) was a British supersonic research aircraft built by the Bristol Aeroplane Company in the 1950s. Its length, slender cross-section and intended purpose led to its being nicknamed the "Flaming Pencil". It failed to attain the designed M2 speed and couldn't maintain top speed long enough to study thermal effects of supersonic flight. Cancelled in 1964.
The Ling-Temco-Vought (LTV) is a tiltwing experimental aircraft designed to investigate the operational suitability of vertical/short takeoff and landing transports. An first flew conventionally on 29 September and on 11 January