AM-38

AM-38
Varga Attila · CC BY-SA 3.0 · source
Name	AM-38
Type	Aircraft engine
Designer	Alexander Mikulin
Country	Soviet Union
Produced	1940–1945
Used by	Red Army Air Force, Soviet Naval Aviation
Wars	World War II

AM-38

The AM-38 was a piston aircraft engine developed in the Soviet Union during the late 1930s and fielded in World War II. Designed to provide high power for low-altitude Il-2 ground-attack aircraft and other types, it was a derivative of the AM-35 series refined for robustness and torque. The powerplant influenced Soviet aviation production priorities and featured prominently in debates at the State Defense Committee and among engineers in Kirov Plant and TsIAM.

Design and Development

The AM-38 originated at the design bureau led by Alexander Mikulin within the Klimov Design Bureau lineage at Plant No. 24 and TsIAM facilities. Drawing on experience from the AM-35 and earlier M-100 and M-105 families, the engineers increased displacement and optimized the supercharging system for low-altitude performance needed by the Ilyushin Il-2 and comparable types. Development involved collaboration with technical cadres from Zavod No. 26 and testing at NII VVS proving grounds near Khimki. Political oversight from the People's Commissariat of Aviation Industry and directives from the State Defense Committee shaped production priorities, while field feedback from units tied to Voronezh Front and Stalingrad operations prompted iterative improvements.

Technical Specifications

The AM-38 was a liquid-cooled, 12-cylinder, vee-type piston engine with increased bore and stroke relative to the AM-35 to yield higher low-altitude torque suitable for ground-attack roles. Its single-stage, single-speed supercharger and revised intercooling afforded peak rated power at lower altitudes, harmonizing with Il-2 mission profiles during operations around Kursk and Orel. Key manufacturing partners included ZIL for crankshafts and Baranov Plant for crankcases. Valve trains, lubrication systems, and carburetion configurations were influenced by practices at TsIAM and testing results from GFRI. The engine used high-octane fuel supplied through logistics routes involving Baikal-Amur Mainline suppliers and wartime fuel logistics managed by Soviet Railways.

Operational History

The AM-38 entered service as the principal engine for the Il-2 from early 1941 frontline operations onward, supporting sorties in Leningrad sector airfields and later in southern sectors such as Stalingrad and the Caucasus. Its low-altitude power made it effective during close air support missions coordinated with Red Army armored formations during the Battle of Kursk and numerous partisan-supported operations. Reports from frontline maintenance depots at Smolensk and Bryansk highlighted its durability under combat stress, while strategic decisions by the State Defense Committee prioritized its mass production. AM-38-equipped aircraft were employed in anti-armor attacks aided by tactics developed at VVS tactical schools and influenced by doctrine discussed at Stavka briefings.

Variants and Modifications

Several subvariants and modifications emerged to address overheating, reliability, and production simplification. Technical offices at TsIAM and field workshops at Factory No. 24 produced reinforced crankshaft versions and modified cooling jackets for tropicalized operations in southern fronts near the Caucasus. Experimental adaptations included carburetor changes trialed at GFRI and strengthened mounts for use in navalized aircraft by Soviet Naval Aviation. Postwar derivative work influenced later Mikulin designs and informed decisions at design bureaus such as Klimov. Some experimental projects sought to re-supercharge AM-38 cores for improved high-altitude performance in prototypes evaluated at NII VVS.

Production and Deployment

Mass production was executed across multiple Soviet plants, notably Plant No. 24, Plant No. 26, and facilities managed by the People's Commissariat of Aviation Industry. Wartime dispersal saw component manufacture moved to satellite factories in Sverdlovsk and Kazan to mitigate threats from frontline advances during Operation Barbarossa. Logistics for piston rings and alloy forgings relied on metallurgical centers in Magnitogorsk and Uralvagonzavod feed lines. Deployment prioritized Il-2 production runs at Gorky and Tashkent assembly lines; the engine’s role in massed ground-attack aviation was a factor in aircraft allocation decisions at Stavka and the Red Army air order of battle.

Surviving Examples and Legacy

Surviving AM-38 engines are preserved in museums such as Monino and regional collections in Kronstadt and Kubinka, where restoration efforts have involved collaboration with institutes like GFRI. The engine’s legacy persists in studies at MAI and historical analyses by scholars affiliated with Russian Academy of Sciences. As a technical milestone, the AM-38 influenced postwar Soviet powerplant design and is referenced in veterans’ memoirs from pilots assigned to Il-2 units during World War II campaigns. Category:Aircraft engines