The Avia BH-21, first flown in 1925, was a robust biplane that served an important role in securing Czechoslovak national security during the period between World War I and World War II. As well as being a competent fighter, it was also an accomplished racer, winning several air races in 1925.
The Dewoitine D.27 was a parasol monoplane fighter aircraft designed by Émile Dewoitine in 1928.
The Avia BH-3 was a fighter plane built in Czechoslovakia in 1921. Conceptually a descendant of the BH-1 sports plane, it was a braced, low-wing monoplane of conventional configuration and tailskid undercarriage. Following favourable trials in June 1921, ten examples were ordered by the Czechoslovakian Air Force. These were delivered in 1923 under the military designation B.3. The type proved temperamental in service and was soon relegated to training duties, where it served until 1927.
The Avia BH-6 was a prototype fighter aircraft built in Czechoslovakia in 1923. It was a single-bay biplane of unusual configuration, developed in tandem with the BH-7, which shared its fuselage and tail design.
The Avia BH-7 was a prototype fighter aircraft built in Czechoslovakia in 1923. It was a parasol-wing monoplane developed in tandem with, and as an alternative to the BH-6, which shared its fuselage and tail design. Like the BH-6, the BH-7 was involved in a number of serious crashes during its test programme, which led to its abandonment as a fighter. Undaunted, however, Avia used the design as the basis for a racing aircraft, shortening the wingspan by 1.4 m, fairing the wing directly onto the top of the fuselage and dispensing with the cabane struts. This revised version was designated BH-7B and the fighter (retrospectively) as the BH-7A. When the design proved no more successful as a racer, it was finally put to rest.
The Avia BH-8 was a prototype fighter aircraft built in Czechoslovakia in 1923. It was an unequal-span biplane developed on the basis of the ill-fated BH-6 design, in an attempt to address that type's problems. It shared the BH-6's unusual wing cellule design.
The Avia BH-9 was a single-seat sports plane built in Czechoslovakia in 1923, based on the BH-5. As with other developments in the BH-1 lineage, the BH-9 was a low-wing braced monoplane that accommodated the pilot and passenger in tandem, open cockpits. The BH-9's structure was strengthened to allow the use of a higher-power engine than in its predecessors, and for the first time, this was a domestically-produced powerplant.
The Avia BH-10 was a single-seat aerobatic sports plane built in Czechoslovakia in 1924, based on the Avia BH-9, which was in turn developed from the BH-5 and BH-1. It was easily visually distinguished from the BH-9 by the tall anti-roll pylon added behind the open cockpit in order to protect the pilot in the event that the aircraft flipped over or crashed while inverted. At least 20 examples were bought by the Czechoslovakian Army as a training aircraft and operated under the designation B.10.
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-17 was a biplane fighter aircraft built in Czechoslovakia in 1924. It was a development of the BH-6 and BH-8, and work on the latter aircraft was cut short in favour of this one. Operational trials in 1924 revealed performance good enough for the Czech Air Force to place an order for 24 examples. In actual service, however, the BH-17 proved unreliable and was soon withdrawn.
The Avia BH-19 was a fighter aircraft built in Czechoslovakia in 1924. It was a low-wing braced monoplane derived from the Avia BH-3 and reflected its designers' ongoing belief that the monoplane configuration was the most suitable for a fighter aircraft. Initial trials revealed excellent performance, but also displayed control problems and aileron flutter. Nevertheless, the Czechoslovakian Army was sufficiently impressed to inform Avia that it would order the BH-19 if the problems could be rectified. The first prototype was destroyed in a crash during speed trials, and the second prototype revealed no better handling than its predecessor. At this point, the Czechoslovakian War Ministry stepped in and asked Avia to cease its attempts to develop a monoplane fighter.
The Avia BH-22 was a trainer aircraft built in Czechoslovakia in 1925, based on the BH-21 fighter. A smaller engine was used and armament removed. The lighter engine required the wing stagger to be decreased. No significant modifications were made to the airframe structure, reduced weight further increasing the ultimate load factor. Some aeroplanes carried a camera gun. The type saw long service as a special aerobatic trainer and eventually several examples found their way into Czechoslovakia's aero clubs.
The Avia BH-23 was a prototype night fighter aircraft built in Czechoslovakia in 1926. The design was derived from the BH-21 day fighter, incorporating structural changes made to the BH-22 trainer, and the type was originally designated BH-22N. Searchlights and other night-flying equipment were added, but the Czechoslovak Air Force were not interested in the project and no sale resulted.
The CAMS 46 was a flying boat trainer aircraft built in France in the mid-1920s, essentially an updated version of the CAMS 30 that had flown in 1922. While retaining that aircraft's basic form, CAMS offered the French Navy two new versions with aerodynamic refinements over the earlier aircraft: the CAMS 46 E primary trainer, and the CAMS 46 ET intermediate trainer. Only the latter was selected for production and was built in quantity to supply one escadrille at the Naval training station at Hourtin.
The Gourdou-Leseurre Type A, retrospectively named the GL.1, was a prototype fighter aircraft built in France in 1918. It was a conventional parasol-wing monoplane with fixed tailskid undercarriage, with main units connected by a cross-axle. The pilot sat in an open cockpit. Construction was of fabric-covered wood and steel. Initial flight testing revealed performance superior to most contemporary biplane fighters and led to an order of 100 aircraft being placed. However, further tests suggested that the aircraft structure could be considerably lightened, and that the wing needed to be stiffened, leading to a cancellation of the order.
The Latécoère 290 was a torpedo bomber floatplane produced in France during the 1930s. Designed by Latécoère in response to an Aéronavale specification for such an aircraft, the 290 was based on its successful Laté 28.3 mail plane. It was a conventional high-wing, strut-braced monoplane that carried a single torpedo externally under the fuselage.
The Lioré et Olivier LeO 25 was a bomber aircraft produced in France in the late 1920s.
The Lioré et Olivier LeO H-43 was a reconnaissance seaplane produced in France in the 1930s. It was a strut-braced, mid-wing monoplane of largely conventional design, provided with an observation balcony underneath the fuselage. It was designed to be launched by catapult from warships and, after a first flight in 1934, trials were conducted on board Commandant Teste.
The Morane-Saulnier BB was a military observation aircraft produced in France during World War I for use by Britain's Royal Flying Corps. It was a conventional single-bay biplane design with seating for the pilot and observer in tandem, open cockpits. The original order called for 150 aircraft powered by 110-hp Le Rhône 9J rotary engines, but shortages meant that most of the 94 aircraft eventually built were delivered with 80 hp Le Rhône 9C rotaries instead. A water-cooled Hispano-Suiza 8A engine was trialled as an alternative in the Type BH, but this remained experimental only. A production licence was sold to the Spanish company Compañía Española de Construcciones Aeronáuticas (CECA), which built twelve fitted with Hispano-Suiza engines in 1916.
The Praga BH-41, later redesignated E-41, was a military advanced trainer aircraft produced in Czechoslovakia during the 1930s.
