The Farner HF Colibri 1 SL was an unusual canard motor glider with a unique control system, designed and built in Switzerland in the late 1970s.
Hans U. Farner was an innovative Swiss aircraft designer whose footlaunched canard ultralight sailplane had briefly reached production in 1966.
The Colibri was a twin engined motor glider, with two single cylinder two stroke McCulloch MC-101A, each of 10.1 kW (13.6 hp) driving a two blade pusher configuration propeller via reduction gear and a high positioned shaft, just below and a little way behind the trailing edge.
Under the drive shaft the fuselage remained deep but tapered rearwards into two door like aerofoils with straight, vertical trailing edges that could be opened symmetrically outwards as an airbrake.
The parallel chord, unswept, high aspect ratio canard, carried on its constant diameter tube in the manner described in the patent, providing lift and both yaw and pitch control.