12/31/2007. This is the first prototype fitted with two 4,850 lb
(2,200 KG) s.t Bristol Orpheus 1/5 turbojets, production aircraft were
fitted with four 3,000 lb (1,361 kg) s.t Pratt & Whitney JT12A-6
turbojets. It was first flown on September 4, 1957.
