The Aero A.12 was a Czechoslovakian biplane light bomber and military reconnaissance aircraft manufactured in small numbers shortly after World War I. Although reminiscent of the Hansa-Brandenburg-designed aircraft that Aero was building during the war under licence as the Ae.10, the A.12 was the company's own design. It is perhaps most significant as the direct descendant of the highly successful A.11 and its various derivatives. An example of the type is preserved at the Letecké Muzeum in Kbely.
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 Avia BH-11 was a two-seat sport aircraft built in Czechoslovakia in 1923, a further development of the Avia BH-9. The main changes in this version involved a redesign of the forward fuselage. 15 examples were ordered by the Czechoslovakian Army as trainers and general liaison aircraft, and operated under the military designation B.11.
The Avia BH-25 was a biplane airliner built in Czechoslovakia in 1926.
The Avia BH-29 was a trainer aircraft built in Czechoslovakia in 1927, in the hope of marketing it to both the Czechoslovakian Army, and to Czechoslovakian Airlines as a primary trainer. It was a conventional design, an unequal-span biplane of wooden construction and with tailskid undercarriage. The pilot and instructor sat in tandem open cockpits. A more powerful version was built, powered by a 120 hp (89 kW) Walter NZ-120 radial engine.
The Breda A.7 was a reconnaissance aircraft developed in Italy for use by the Regia Aeronautica in 1929. It was a braced parasol monoplane of conventional configuration with tailskid undercarriage. The pilot and observer sat in tandem, open cockpits. A single prototype of a long-range example, originally designated A.7 Raid and later A.16 was also constructed, but the air force showed no interest in it.
The Dewoitine D.21 was 1920s French open-cockpit, fixed-undercarriage monoplane fighter aircraft.
The Fokker C.VII-W was a reconnaissance seaplane built in the Netherlands in the late 1920s. Sharing elements of the highly successful C.V design, the C.VII-W was a conventional, single-bay biplane with wings of unequal span braced with N-struts. The undercarriage consisted of a standard twin-pontoon arrangement, and the fin and rudder continued through to the ventral side of the fuselage, creating a cruciform tail. The pilot and observer sat in tandem, open cockpits. The wing structure was wooden with fabric and plywood covering, and the fuselage was of steel tube construction with fabric covering.
The PWS-1 was a Polish two-seat fighter and reconnaissance aircraft, constructed by Podlaska Wytwórnia Samolotów (PWS) in 1927, which remained a prototype.
The Beardmore W.B.II was a British monoplane fighter prototype of the 1910s.
The Levasseur PL.5 was a carrier-based fighter produced in France in the late 1920s, in response to the 1924 AMBC.2 specification issued by the Service Technique de l'Aéronautique (STAé). It was a conventional, single-bay sesquiplane that carried a crew of two in tandem, open cockpits. Like other Levasseur naval designs of the day, it incorporated several safety features in case of ditching at sea. Apart from small floats attached directly to the undersides of the lower wing, the main units of the fixed, tail-skid undercarriage could be jettisoned in flight, and the underside of the fuselage was given a boat-like shape and made watertight.
The Levasseur PL.6 C.2, also known as Levasseur VI C.2, was a two-seat fighter aircraft built in France in 1926 in order to meet a 1925 C.2 Service Technique de l'Aéronautique (STAé) specification,. Constructed along the same lines as Levasseur's naval aircraft of the same era, it was a conventional, single-bay biplane with seating for the pilot and tail gunner in separate, open cockpits. Flight testing of the prototype commenced in 1926, and it was exhibited at the Salon de l'Aéronautique at the end of the year.
The Wibault 12 Sirocco or Wib 12 Sirocco was a two-seat, parasol wing fighter aircraft designed and built in France in the 1920s. Three fighter prototypes were completed, one for the RAF and two Army co-operation variants. There was no series production.
The Levy Biche LB.2 was a single seat French sesquiplane fighter aircraft designed to be used from aircraft carriers. With a watertight fuselage, jettisonable wheeled undercarriage and small under-wing floats, it could survive emergency sea touchdowns; it could also be fitted with seaplane type floats.
The Wibault 10/II Tramontane was a two-seat reconnaissance aircraft designed and built by Société des Avions Michel Wibault in France for the French military 1923 A.2 competition for a 2-seater reconnaissance aircraft.
The Descamps 17 A.2 was a two-seat reconnaissance fighter built under a French government programme of 1923. Two versions, with different engines, were tested and six examples were built under licence by Caudron as the Caudron C.17 A.2.
The de Marçay 2 C1 was a single seat biplane fighter designed in France and first flown in 1919. It did not go into production.
The Les Mureaux 3 C.2 and Les Mureaux 4 C.2 were French two seat, parasol winged fighters, flown in 1927-8, which differed only in their engines. They were developed into near identical army co-operation types, the ANF Les Mureaux 130 A.2 and ANF Les Mureaux 131 A.2, in 1929-31.
The SPCA 10 or SPCA Paulhan-Pillard E.5 was a large, all-metal, French reconnaissance and bomber flying boat flown in 1928. Only one was built and this was lost in a fatal crash during development.
The Caproni Ca.66 and Caproni Ca.67 were Italian night bomber aircraft designed to re-equip the post-World War I Regia Aeronautica.
