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The General Aircraft GAL.56 was a family of 1940s British experimental tailless swept wing glider designs.
PZL.12 (PZL-H) was a prototype of a Polish amphibious flying boat designed and built in 1931 by Zygmunt Puławski, a pioneering Polish designer. He was killed in a crash involving this design.
The Praga E.114 was a single-engine sport airplane, designed and manufactured by the Czechoslovakian company ČKD-Praga. Due to its light weight it was also called Air Baby.
The Handley Page H.P.31 was a two-seat single-engined biplane built to a British specification for a carrier-based torpedo bomber and reconnaissance aircraft. After trials, the Blackburn Ripon was preferred, though the Harrow played a significant role in the development of automatic slots.
The Potez 661 was a four-engined metal low-wing monoplane airliner developed in France just before World War II. The single example flew with Air Afrique on French colonial routes.
The Boeing XPB was an American twin-engined biplane long-range patrol flying boat of the 1920s. A single example was built for the United States Navy.
The Lemberger LD20b was a single-engine cantilever biplane designed to be easily towable behind a car. Built in Germany in 1971, it made several flights but did not enter production.
The Schreder HP-22 was an American mid-wing, amphibious flying boat, cruciform tailed, two seat motor glider project that was designed by Richard Schreder. None were ever completed or flown.
The Timm T-840 was a twin engine, high wing passenger aircraft designed and flown in the United States in 1938. Equipped with a tricycle undercarriage and low speed aerodynamic devices, it could be configured to carry between six and ten passengers. Only one was built.
The Sud-Est SE-2300 or S.N.C.A.S.E. SE-2300 was a two/three seat low wing, single engine touring aircraft, built just after World War II in France. The SE-2310 was a tricycle undercarriage variant. Neither type went into production.
The Potez-CAMS 160 was a one-off 5/13 scale flight model built in France, first flown in the summer of 1938 to test aerodynamic and hydrodynamic qualities of the Potez-CAMS 161 airliner and mail carrier, which was too large for detailed modelling in existing wind tunnels.
The Albatros L.71 was a two-seat, single pusher engined biplane built in Germany in the 1920s.
The Speedtwin E2E Comet 1, originally named the Phillips ST1 Speedtwin, is a two-seat, twin engined aircraft designed in the UK to be capable of aerobatics and the only civil twin certified for intentional spinning. After a long development time, just two have been built.
The SFCA Taupin was a French tandem-wing aircraft, designed to provide a simple, stable and safe aircraft able to take-off and land in small spaces.
The Latham HB.5 was a French biplane flying boat with four engines in push-pull configuration pairs. Ten were used by the French Navy.
The Régnier 12 was a 1930s Belgian touring aircraft offering variants with different engines and seating plans. Only one was built.
The Möller Stomo 3 was a small, low-powered but very aerodynamically-clean light aircraft, first flown in Germany in 1939. It set two speed over distance records for aircraft with engines of less than 2 l (120 cu in) capacity soon after its first flight.
The Lioré et Olivier LeO H-23 was a French military flying boat, primarily intended for coastal reconnaissance, though able to carry a small bomb load. Only one was built.
The Medwecki and Nowakowski M.N.5 was an economical Polish trainer aircraft initially aimed at the club market, though there was also some military interest. It performed well but lacked a constructor after Samolot became insolvent in 1930, so only one was completed.
The Orliński RO-7 Orlik (Eaglet) was a prize-winning Polish home-built aircraft, first flown in 1987. It was restored to flight, with improvements, in 2003.