English Electric Lightning P1A, c 1950s.
© Science Museum / Science & Society Picture Library
Wind tunnel model (scale 1:84). Three prototype P1A aircraft were ordered and the first (WG760) flew on 4th August 1954. No operational equipment was built in and the power was provided by two Sapphire Sa5 engines of 8100 lbs thrust. The engines were mounted one above the other, but staggered to reduce frontal area. On its third flight on 11th August, WG760 became the first British aircraft to exceed Mach 1 in level flight. The Lightning entered service with the RAF in 1960.