The Aero Boero AB-115 is an Argentine civil utility aircraft. It was developed from the AB-95-115, a refined AB-95 with a more powerful engine and improved aerodynamics. Specific differences included wheel spats, a redesigned engine cowling molded of fiberglass, and aluminum ailerons and flaps.
The Gregor FDB-1 was a Canadian biplane fighter, designed in 1938 by Michael Gregor and manufactured by Canadian Car and Foundry. Despite having some advanced design features such as flush rivetted all-metal construction and a retractable undercarriage, the final generation of biplane fighters was being supplanted by monoplanes and the Gregor FDB-1 was obsolete before it flew. Despite the Royal Canadian Air Force's desperation for modern fighters, the sole example remained unsold and was eventually lost in a fire in 1945. The Gregor FDB-1's model designation stood for Fighter Dive Bomber indicating its intended roles.
The Zuch was a Polish aerobatics and trainer aircraft, built in 1948 in the LWD bureau and produced in a small series.
PZL.26 was a Polish sports plane built in 1934 in the PZL works. Ordered by the Ministry of Defence, it was specifically designed for the upcoming Challenge 1934 International Touring Aircraft Contest.
The Fisher Horizon is a family of Canadian two-seats-in-tandem, conventional landing gear, single-engined, high-wing monoplane kit aircraft designed for construction by amateur builders. The Horizon 1 was inspired by the Aeronca Champion and its later version, the Bellanca Citabria, while the Horizon 2 was inspired by the Cessna O-1 Bird Dog.
The Thaden T-2 was a 1920s American four-seat all-metal cabin monoplane built by the Thaden Metal Aircraft Company of San Francisco, California.
The Mercury Chic T-2 was a lightweight American parasol wing monoplane designed and built by the Mercury Aircraft Inc. in the late 1920s. Flown for the first time in 1928, about 27 were built, but due to the early 1930s economic depression only 15 were sold, and the rest were scrapped.
The Müller G.M.G. II was a German single engine, tandem seat sports monoplane from 1928. Its high wing was unusually mounted.
The Brown 1926 parasol monoplane was a 1920s US, three seat, parasol wing civil aircraft developed from a biplane wartime scout. It was intended for either the private or commercial passenger markets, though one was used as a crop-duster.
The Yackey Monoplane was an American three seat parasol monoplane flown in the late 1920s. Two prototypes had some success in the 1927 New York - Spokane National Air Derby and orders were placed but a crash killed its designer and ended production.
The Thunderbird W-14 was a small, three seat American passenger transport, first flown in 1926, entering production, significantly improved, in 1927 with several different engine options. About 40-50 were built before the financial collapse of the company in 1929.
The Stiles Dragon Fly was an American two seat monoplane aircraft of the late 1920s. It was aimed at private and club owners. Significant production was planned but few were built.
The Simplex Red Arrow was a US single-engined monoplane produced in the late 1920s and early 1930s and intended as club machine or mail transport. Most used radial engines in the 90–110 hp (67–82 kW) range. They carried one or two passengers whose seats could be open or enclosed. One variant, the Red Arrow Dual Plane, was easily converted from monoplane to biplane and was available with two versions of the much more powerful Wright Whirlwind engines. In all about 20 were built.
The Gee Bee Model A was an American two-seat open cockpit single-bay biplane developed by the Granville Brothers that first flew in 1929.
The Inland Sport series of parasol wing, sport and training side-by-side two seaters, introduced between 1928 and 1930, differed chiefly in their engines. They used three different radial engines, more than doubling the Sport's power over two years of development. 34 examples were built and frequently re-engined.
The Watkins Skylark was an American low-wing, cantilever two-seater designed for private and club use. A large anticipated production run in 1930 ended early when the company collapsed in the Great Depression, with only five or six registered.
The Ireland Privateer was a 1930s American two-seat, single pusher-engined monoplane sports flying boat which could be equipped as an amphibian. About 18 were built.
The Cairns A was a low wing, two tandem seat monoplane with a metal structure and stressed metal skin. It first flew late in 1931 with a 90 hp (67 kW) engine but was later fitted with more powerful engines including a 185 hp (138 kW) radial.
The Waterman Flex-Wing was a four seat cabin aircraft designed to be easy for non-expert pilots to fly. Its principle safety features were based on a hinged wing providing controllable and interconnected dihedral and incidence. Two were built but the absence of funding in the difficult trading conditions of the Great Depression ended the project.
The States Super Monoplane was a tandem two seat, civil sport and trainer aircraft built in small numbers at the start of the U.S Great Depression.
