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Allison X-4520 24-Cylinder Aircraft Engine - The 24-cylinder X-4520 engine was designed by the Power Plant Section at McCook Field and refined and built by Allison in 1925. A four-year delay before the engine was run left little interest to continue the project.
Argus As 5 Aircraft Engine - With a displacement of 5,742 cu in (94.1 L), the Argus As 5 exemplified the 1920s concept of using a single large engine to power a large aircraft. The 1,500 hp (1,120 kW) engine was too large for contemporary aircraft.
Armstrong Siddeley ‘Dog’ Aircraft Engines - In the 1930s, Armstrong Siddeley started a new line of engines named after dogs (canines). Most of these engines were radials with banks of inline cylinders. The most famous engine of the series was the Deerhound.
Beardmore Cyclone, Typhoon, and Simoon Aircraft Engines - The Beardmore Cyclone, Typhoon, and Simoon were a series of powerful, straight six- and straight eight-cylinder aircraft engines built in Britain in the 1920s. The large size of the engines limited their use.
Beardmore Tornado Diesel Airship Engine - The Beardmore Tornado was a 5,132 cu in (84.1 L), eight-cylinder, diesel engine that produced 650 hp (485 kw). Five Tornado engines powered the British R101 airship, which crashed in October 1930, killing 48 people.
Bréguet-Bugatti 32A and 32B Quadimoteurs - The Bréguet-Bugatti Quadimoteurs were named for their configuration of four essentially independent engines coupled together to create one powerful engine. The engines’ size and complexity limited their usefulness.
Bristol Hydra 16-Cylinder Radial Aircraft Engine - The Bristol Hydra of the early 1930s was one of the most unusual radial engines ever built. Its two rows of eight cylinders were inline. Vibration issues and promising developments with sleeve valves led to its demise.
Clerget 16 H Diesel Aircraft Engine - The Clerget 16 H was a V-16 fitted with four turbosuperchargers. First run in 1939, the engine displaced 4,969 cu in (81.43 L), produced 2,000 hp (1,491 kW), and was intended to power transatlantic passenger aircraft.
Curtiss H-1640 Chieftain Aircraft Engine - The Curtiss H-1640 Chieftain was a 600 hp (447 kW), 12-cylinder, air-cooled, inline radial aircraft engine. The engine was first run in 1927, but its overheating issues were never resolved.
Daimler-Benz DB 602 (LOF-6) V-16 Diesel Airship Engine - The DB 602 V-16 was a world-class diesel airship engine built by Daimler-Benz in the 1930s. Because of the ill-fated Hindenburg and the end of the airship era, the engine never left a direct mark on history.
Deschamps V 3050 Diesel Aircraft Engine - The Deschamps V 3050 was an attempt to create a powerful diesel aircraft engine. The inverted V-12 engine produced 1,200 hp (895 kW) in 1934, but the lack of funds prevented the engine from being thoroughly tested.
Fairey P.12 Prince Aircraft Engine - Starting in the mid-1920s, the Fairey Aviation Company made a number of attempts to enter the aircraft engine business in Britain. Designed by Richard Forsyth, the P.12 Prince was their first original design.
Farman 18T 18-Cylinder Aircraft Engine - The Farman 18T was a uniquely shaped aircraft engine intended to power a Schneider Trophy racer built by Bernard. The aircraft never materialized, nor did any challenger from France for the 1931 race.
FIAT AS.6 Aircraft Engine (for the MC.72) - The FIAT AS.6 engine ultimately produced 3,100 hp (2,312 kW) and was used to propel the MC.72 to 440.682 mph (709.209 km/h). But development of the 24-cylinder engine was plagued with issues and cost several lives.
FIAT AS.8 Engine and CMASA CS.15 Racer - Powered by the 2,250 hp (1,678 kW) FIAT AS.8 V-16 engine, the Italian CMASA CS.15 racer was intended to set a new world speed record for aircraft, but WWII prevented the aircraft from being completed.
General Airmotors / Moore Three Valve Aircraft Engine - In the late 1929, Robert Moore built a 150 hp (112 kW), five-cylinder, radial engine that used three valves per cylinder. Lack of sales during the Great Depression resulted in the engine being discontinued.
Hispano-Suiza 18R and 18Sb Aircraft Engines - The Hispano-Suiza 18R and 18Sb were a series of high-performance W-18 aircraft engines. The engines displaced 3,300 cu in (54.1 L) but never developed the intended 1,680 hp (1,253 kW).
Hispano-Suiza 24Y (Type 82 and Type 90) Aircraft Engine - Based on the Hispano-Suiza 12Y, the 24Y was an attempt to create a 2,200 hp (1,641 kW) H-24 engine. The start of WWII changed priorities for the French company, and the engine was abandoned.
IAM M-44 V-12 Aircraft Engine - Designed in the 1930s for very large Soviet aircraft, the IAM M-44 was the largest V-12 aircraft engine ever built. It displaced 8,107 cu in (132.9 L) and produced 2,000 hp (1,491 kW) but never entered production.
Isotta Fraschini W-18 Aircraft and Marine Engines - In the 1920s and 1930s, Isotta Fraschini developed the Asso 750 and Asso 1000 W-18 aircraft engines. Although used in a number of aircraft, the engine found a much longer life in marine applications.
Lycoming O-1230 Flat-12 Aircraft Engine - In 1932, Lycoming began developing a high-performance engine to meet the Army Air Corps’ needs. The engine became the O-1230, but it was outclassed by the time it was ready for production.
Marchetti Cam-Action Engines - Italian immigrant to the US, Paul Marchetti designed a number of crankless aircraft engines called cam-action engines in the 1920s. Marchetti had just started his business when he died in a crash while learning to fly.
Menasco 2-544 Unitwin Aircraft Engine - In an attempt to create a more powerful engine, Al Menasco combined two six-cylinder engines to make the 1,090 cu in (17.9 L) U-12 Unitwin. Its 660 hp (492 kW) output fell short of the 700 hp (522 kW) forecasted.
Napier Cub (E66) – First 1,000 hp Aircraft Engine - When it was first run in 1920, the Napier Cub was the world’s most powerful aircraft engine. The 16-cylinder engine displaced 3,682 cu in (60.3 L) and produced 1,000 hp (746 kW) but was too large to be practical.
Packard X-2775 24-Cylinder Aircraft Engine - The Packard X-2775 (1A-2775) X-24 was a light, compact, and powerful aircraft engine. Trouble with the Kirkham-Williams and Williams Mercury Racers prevented the engine from proving itself.
Pratt & Whitney R-2060 ‘Yellow Jacket’ 20-Cylinder Engine - The R-2060 Yellow Jacket was the first liquid-cooled engine built by Pratt & Whitney. However, the 20-cylinder, inline-radial engine was never fully developed and only one was built.
Sunbeam Sikh I, II, and III Aircraft Engines - The Sunbeam Sikh were a series of powerful aircraft engines built in the 1920s. The V-12 Sikh I had six valves per cylinder and displaced 3,913 cu in (64.1 L). Only a small number of the Sikh engines were made.
Tips Aero Motor Rotary Aircraft Engines - Designed by Maurice Tips, who was originally from Belgium, the Tips aircraft engines were a unique series of rotary engines with rotary valves.