11/30/2008. Remarks by Johan Visschedijk: "The swept-wing tailless Pterodactyl was designed by Captain Geoffrey Hill based on earlier work by John W. Dunne. The first single-seat version was built at Farnborough, initially flown as a glider, after funding of the Air Ministry it was fitted with a 32 hp Bristol Cherub III two-cylinder horizontally-opposed engine and the Pterodactyl Mk.I, seriated J8067, made its first flight on November 2, 1925.

Westland was chosen by the Air Ministry to develop the type, Captain Hill joining the company for design assistance. The side-by-side two-seat Mk.IA was aerodynamic cleaner and of superior construction and the first flight was made at RAF Andover, Hampshire, in June 1928. It carried the s/n J9251. Re-engined with a 52 hp Armstrong Siddeley Genet five-cylinder radial it was redesignated Pterodactyl Mk.IB.

The landing landing gear consisted of a single main wheel and two trailing balancer wheels, replacement of the single central wheel by a tandem wheel gear (with front wheel steerable), led to the redesignation Pterodactyl Mk.IC."