The Druine D.31 Turbulent is a French single-seat ultralight Homebuilt aircraft designed by Roger Druine. The D.31 Turbulent was designed to be amateur-built and is a single-seat ultra-light aircraft with cantilever low-wing and fixed tailwheel landing gear. Designed to be powered by a 30hp (1200cc) Volkswagen or similar engine. The fuselage and wings use wood construction with fabric covering. Rollason Aircraft & Engines Limited produced 26 factory-built D.31 aircraft in the United Kingdom and three D.31A models with strengthened wing spar in order to get a full British certificate of Airworthiness. Five Turbulents are operated by the Tiger Club in 2019. The rights to plans for the design are held by the UK Light Aircraft Association. Variants D.3 Original design and prototypes D.30 powered by 25 hp (19 kW) Ava 4A-00 D.31 Standard home-built and factory built variant. Initially built by Rollason Aircraft & Engines with 1200cc VW engine but standardized on the 1600cc Ardem 4CO2 modified VW engine. The Tiger Club have modified their aircraft to use Leburg Electronic Ignition. D.31A Factory & homebuilt aircraft incorporating factory designed (by Rollason Aircraft & Engines) strengthened main spar to allow C of A certification. Top speed = 115 Knots. Max weight = 317 kg D.32 powered by Sarolea Epervier D.35 powered by Porsche D.36 powered by JAP J-99, G-APOL but later re-engined to D.31 standard.
