Aircraft Engines: Post World War II

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Arsenal 24H rear Arsenal 24H and 24H Tandem Aircraft Engines - The Arsenal 24H was a post-WWII French aircraft engine that used many components from the Junkers Jumo 213. The 24H was capable of 4,000 hp (2,983 kW), but the dawn of the jet age made the engine obsolete.
Dobrynin VD-4K CPO Saturn Dobrynin M-250, VD-3TK, and VD-4K Aircraft Engines - Through and after WWII, Soviet engineer Vladimir Dobrynin developed a series of 24-cylinder aircraft engines. These inline radial engines had six cylinder banks and produced 2,200 to 4,300 hp (1,640 to 3,207 kW).
Hispano-Suiza 24Z left Hispano-Suiza 24Z (Type 95) Aircraft Engine - Drawing inspiration from the 24Y engine, Hispano-Suiza developed the 24Z. The jet age made the large, 3,600 hp (2,685 kW) H-24 engine obsolete.
Junkers-Jumo-224-side Junkers Jumo 224 Aircraft Engine - Following the Jumo 223, Junkers designed a larger, 24-cylinder, diesel, opposed-piston, aircraft engine that was forecasted to produce 4,400 hp (3,280 kW). Taken over by the USSR after the war, the engine was redesignated M-224.
Napier Nomad II rear Napier Nomad Compound Aircraft Engine - The Napier Nomad was a compound piston/turbine aircraft engine designed shortly after WWII. Despite its complexity, the engine achieved new levels of fuel economy, but it could not compete with gas turbines.
Zvezda M503 Rear Yakovlev M-501 and Zvezda M503 and M504 Diesel Engines - One of the largest aircraft engines ever built, the 42-cylinder Yakovlev M-501 was modified into the Zvezda M503 marine engine. A further redesign created the 56-cylinder Zvezda M504.