The Vought XF3U was the prototype of a two-seat, all-metal biplane fighter, built by Vought Aircraft Company of Dallas, Texas for the United States Navy.
The Berliner-Joyce XFJ was a United States prototype biplane fighter aircraft that first flew in May 1930. Designed by Berliner-Joyce Aircraft for the United States Navy, its lower wing, placed below the fuselage and just two feet above the ground, apparently gave it a tendency to ground loop when landing, and it was never ordered for production.
The Vought XF2U was a prototype biplane fighter aircraft evaluated by the United States Navy at the end of the 1920s, but was already outclassed by competing designs and never put into production.
The Boeing XP-15 was an American prototype monoplane fighter.
The Macchi M.39 was a racing seaplane designed and built by the Italian aircraft manufacturer Aeronautica Macchi. The type is most remembered for its settings of multiple world speed records during the mid 1920s, as well as for winning the Schneider Trophy, for which the M.39 had been specifically developed.
The Douglas T2D was an American twin-engined torpedo bomber contracted by the military, and required to be usable on wheels or floats, and operating from aircraft carriers. It was the first twin-engined aircraft to be operated from an aircraft carrier.
The Blériot-SPAD S.61 was a French fighter aircraft developed in 1923. Designed by André Herbemont, the S.61 was a conventional biplane, abandoning the swept upper wing used by Herbemont in several previous designs. The prototype S.61 was evaluated by the French Air Force alongside the S.51 as a potential new fighter, but like its stablemate, was rejected. The Polish Air Force was impressed enough to order 250, as well as purchase licences for local production. The Romanian Air Force also ordered 100 aircraft. About 30 were built in Poland, by the CWL.
The Dayton-Wright RB-1 , also known simply as the Dayton-Wright Racer was a high wing single-engine monoplane racing aircraft developed in the United States to participate in the 1920 Gordon Bennett Cup air race.
The Fokker B.II was a prototype sesquiplane shipboard reconnaissance flying boat built in the Netherlands in 1923.
The Douglas XFD was a carrier-based biplane fighter aircraft designed for the United States Navy, and the first fighter to be built by the Douglas Aircraft Company. A victim of changing requirements, no production was undertaken.
The Loening PA-1 was an American fighter aircraft prototype built by Loening Aeronautical Engineering.
The Wright F2W was an American racing aircraft built by Wright Aeronautical Corporation for the US Navy.
The Wright XF3W was an American racing aircraft built by Wright Aeronautical for the United States Navy.
The Boeing Model 81 was an American training aircraft built by Boeing in 1928. The Model 81 was a development of the Model 64. It was powered by a newly developed engine, the 125 hp Fairchild-Caminez 4-cylinder radial engine. Operating at a much lower rpm than most engines it required the use of a large high-pitch propeller.
The Verville VCP was an American single-engined biplane fighter aircraft of the 1920s. A single example of the VCP-1 was built by the United States Army Air Service's Engineering Division, which was later rebuilt into a successful racing aircraft, while a second, modified fighter was built as the PW-1.
The Nieuport-Delage Sesquiplans were a series of 1920s French racing monoplanes built by Nieuport-Delage. It was the first aircraft to be recorded as achieving 200 mph (321.88 km/h) in level flight and it established a world air speed record in 1923, attaining an airspeed of 205.2 mph (330.275 km/h).
The Tebaldi-Zari was an Italian fighter prototype of 1919. The Breda company later acquired the rights to it.
The Buscaylet-de Monge 5/2 was a 1920s French single-seat, parasol-wing fighter prototype designed by Louis de Monge for the Buscaylet et Cie company.
The Germania C.I was a prototype two-seat general-purpose biplane built by Halberstadt during World War I.
The Halberstadt C.VIII was a prototype two-seat general-purpose biplane built by Halberstadt during World War I.
