The Cirrus and Hermes or Cirrus-Hermes are a series of British aero engines manufactured, under various changes of ownership, from the 1920s until the 1950s. The engines were all air-cooled, four-cylinder inline types, with earlier ones upright and later designs inverted.
The Cierva C.30 is an autogyro designed by Juan de la Cierva and built under licence from the Cierva Autogiro Company by A V Roe & Co Ltd (Avro), Lioré-et-Olivier and Focke-Wulf.
The de Havilland DH.60 Moth is a 1920s British two-seat touring and training aircraft that was developed into a series of aircraft by the de Havilland Aircraft Company.
The Spartan Cruiser was a 1930s British three-engined transport monoplane for 6 to 10 passengers built by Spartan Aircraft Limited at East Cowes, Isle of Wight. It was a development of the Saro-Percival Mailplane for passenger use.
The Armstrong Siddeley Genet Major is a British five-cylinder, air-cooled, radial engine for aircraft, designed and built by Armstrong Siddeley and first run in 1928. It developed 140 horsepower (104 kW). In Royal Air Force use the seven-cylinder version was known as the Civet I. The Feliform names used are in line with company convention, the Genet and Civet both being large cat-like carnivores.
The Avro Avian is a series of British light aircraft designed and built by Avro in the 1920s and 1930s. While the various versions of the Avian were sound aircraft, they were comprehensively outsold by the de Havilland Moth and its descendants.
The Avro Cadet is a single-engined British biplane trainer designed and built by Avro in the 1930s as a smaller development of the Avro Tutor for civil use.
The Avro 627 Mailplane was a British biplane developed in 1931 by Avro from the Avro Antelope bomber as a mail plane for use in Canada. Only one was built which ended up being used as a test bed.
The Blackburn L.1 Bluebird was a British single-engine biplane light trainer/tourer with side-by-side seating, built in small numbers by Blackburn Aircraft in the 1920s.
The Comte AC-4 Gentleman is a 1920s Swiss two-seat sport/training aircraft produced by Flugzeugbau A. Comte.
The Miles Hawk Major was a 1930s British two-seat light monoplane, developed by Miles Aircraft from the Miles Hawk in order to take advantage of the new inverted de Havilland Gipsy Major engine. When fitted with the longer Gipsy Six in place of the forward crew member, it was known as the Miles Hawk Speed Six.
The Farman F.430 was a 1930s French light transport designed and built by the Farman Aviation Works. Two variants with different engines were known as the F.431 and F.432.
The Fairchild 22 Model C7 was an American two-seat touring or training monoplane designed and built by the Kreider-Reisner division of the Fairchild Aircraft Corporation at Hagerstown, Maryland.
The Genairco Biplane was a utility biplane built in small numbers in Australia in the late 1920s and early 1930s.
The Westland Widgeon was a British light aircraft of the 1920s. A single-engined parasol monoplane, the Widgeon was built in small numbers before Westland abandoned production in 1929.
The Southern Martlet was a single-engined, single-seat biplane sports aircraft. Six were built, including the rather different and unsuccessful Metal Martlet.
The BFW M.23, sometimes known as the Messerschmitt M 23, was a 1920s two-seat sporting aircraft designed by Willy Messerschmitt, and produced by Bayerische Flugzeugwerke (BFW). Examples won several prestigious races in 1929 and 1930.
The PWS-51 was a Polish sports plane of 1930, a single-engine low-wing monoplane, constructed by the Podlaska Wytwórnia Samolotów (PWS), that remained a prototype.
The SEA.1 was a Belgian, multi-purpose, light twin engine monoplane flown in 1936. Only one was built; it was later converted into a single engine aircraft and used by the military.
The Ostrovia II or Moryson II was a 1930s Polish club trainer aircraft, a development of the Ostrovia I. Only one was built and was used by the Poznań flying club for five years.
