Although originally conceived as a monoplane, most of Dunne's designs were required by his superior officer Col. Capper to be biplanes, typically featuring a fuselage nacelle between the planes with rear-mounted 'pusher' propeller and twin fins between each pair of wing tips.
Dunne gave some help initially to Geoffrey T. R. Hill who produced the Pterodactyl series of tailless aircraft from 1920s onwards.