de Havilland DH121 Trident
First flown in 1962, the Trident was the second turbojet airliner designed and built at Hatfield. It was designed for speed and economy on short-haul operations by British European Airways, with an advanced 35 degree swept wing for cruise at Mach 0.88. The Trident broke new ground by having three engines, and by having all three at the rear (with the middle engine buried below the fin) so placing the jet exhaust noise behind the passenger cabin. The Trident was also the first airliner in the World to be designed and certified for automatic landing, with the Smiths Industries ‘Autoland’ system.
