The SEA IV was a French two-seat military aircraft of World War I and the immediate post-war era.
The WZ.X was the Polish reconnaissance aircraft designed in the mid-1920s and manufactured in the Centralne Warsztaty Lotnicze (CWL) - Central Aviation Workshops in Warsaw. It was the first combat aircraft of own design built in Poland, in a small series.
The Hawker Hornbill was the last Hawker military aircraft designed under the direction of W. G. Carter. The design was started in 1925 and the first flight took place in July 1925. The Hornbill did not achieve service in the Royal Air Force due to problems in its power plant and radiator. Only one aircraft was built.
The Hawker Hedgehog was a three-seat reconnaissance biplane, to be used for naval scouting, produced to meet Air Ministry Specification 37/22.
The Potez 452 was a French flying boat designed and built by Potez in response to a French Navy specification for a shipboard reconnaissance machine for use on its battleships and cruisers.
The PWS-1 was a Polish two-seat fighter and reconnaissance aircraft constructed by Podlaska Wytwórnia Samolotów (PWS) in 1927. It remained a prototype for its entire lifespan.
The Potez 32 and its military version the Potez 33 was a single-engine French monoplane transport built by Potez and based on the Potez 29 biplane.
The Beardmore W.B.II was a British biplane fighter prototype of the 1910s.
The Tupolev I-8 was an experimental interceptor built in the Soviet Union in the early 1930s. It was the first Soviet aircraft to exceed 300 km/h in level flight. The aircraft was an exercise in developing the Polikarpov I-5 design by a group of engineers led by V. M. Rodionov, each of whom volunteered 70 hours of personal time to the project.
The Loring R-III or R-3 was a 1920s Spanish two-seat sesquiplane reconnaissance and light attack aircraft designed by engineer Eduardo Barrón and built by Dr. Jorge Loring's company — Talleres Loring.
The Potez 75 was a low-cost, simple, ground-support, observation and launch aircraft for anti-tank missiles, designed and built in the early 1950s, for use in colonial conflicts. One hundred and fifteen were ordered in 1956, but cancelled in 1957.
The Caproni CH.1 was a single-seat biplane fighter, a single example of which was produced as a prototype in Italy in 1935.
The Curtiss P-37 was an American fighter aircraft made by Curtiss-Wright in 1937 for the US Army Air Corps. A development of the Curtiss P-36 Hawk to use an inline engine instead of the radial engine of the P-36 the fuselage was lengthened and the cockpit moved back. A small number of YP-37 aircraft was built for Air Corps evaluation. The expected top speed was not achieved and the project terminated in favor of the Curtiss P-40
The Supermarine Sheldrake was a British amphibian biplane flying boat developed by Supermarine from the Supermarine Seagull with a revised hull. It was powered by a Napier Lion engine mounted between the wings driving a four-bladed propeller. Only one Sheldrake, serial number N180, was built.
The SNCAC NC-600 was a prototype French twin-engined long-range fighter aircraft, developed by SNCAC from the earlier Hanriot H.220 fighter. The type never entered service, with development being ended by the French surrender in June 1940.
The Potez 230 was a French lightweight single-seat, single-engined fighter aircraft. One prototype was built and flew in 1940, but no production followed, with the prototype being captured and shipped to Germany for study.
The Potez 26 was a single seat fighter aircraft designed and flown in France in the mid-1920s. It did not reach production.
The Villiers XXIV or Villiers 24 CAN2 was a French army night fighter most notable as the first French military aircraft to be fitted with leading edge slats.
The Potez 23 was a prototype French single-engine fighter biplane designed in 1923.
The Bréguet XI was a prototype French biplane bomber of the First World War.
