Short SB.5
The Short SB.5 (serial WG768) was a "highly unorthodox, adjustable wing" British research aircraft designed by Short Brothers in response to the UK Air Ministry requirement ER.100; to provide input for the design of the English Electric P.1 (prototype of the English Electric Lightning) by testing the low speed flight characteristics of various configurations of wing-sweep required for supersonic flight. The tailplane could be mounted either on top of the fin ("T-tail") or below the fuselage.