Mikulin AM-38

AM-38
	Preserved Mikulin AM-38F engine
Type	Liquid-cooled V-12 piston engine
National origin	USSR
Manufacturer	Mikulin
First run	1941
Major applications	Ilyushin Il-2
Number built	43,191
Developed from	Mikulin AM-35
Developed into	Mikulin AM-42

The Mikulin AM-38 was a 1940s Soviet aircraft piston engine. It was a further development of the Mikulin AM-35 design.^[1] The AM-38 was used on the Il-2 Shturmovik and Il-10 ground attack aircraft. The AM-38 was installed experimentally in a MiG-3 and tested during August 1941. A slight performance improvement was seen at low-altitude but the engine experienced overheating problems due to the cooling and oil systems remaining unchanged from the AM-35A.^[2]

Description

The AM-38 was a low-altitude engine for ground attack aircraft that evolved from the earlier AM-35A. Compared to the AM-35A it had a reduced compression ratio, strengthened crankshaft, a single-speed geared centrifugal supercharger optimized for low-altitude performance, revised cooling system and revised oil system. The AM-38 was developed by the design bureau of Factory No. 24 now called the Salyut factory in Moscow. The first examples were produced in October 1939 and passed its Factory tests in November 1939. The AM-38 was placed in production at the start of 1941 despite not passing its State tests until July 1941. The majority of engines were produced at Factory No. 24 which was evacuated to Kuybyshev at the end of 1941. In June 1942 production also began at Factory No. 45 which used the former workshops of Factory No. 24 in Moscow. The AM-38 was the most produced Mikulin engine with 43,191 built by the time it was phased out of production in 1946.^[3]

Variants

AM-38F: A version with higher RPM for takeoff and a 10-minute forsazh (war emergency power) mode. It also had an oil centrifuge, strengthened camshafts, strengthened cylinder block, strengthened inlet valves and cylinder heads made from a new alloy. The diameter of the GCS impeller was also reduced and its compression ration was lowered to accommodate lower quality fuel. Series production began in at Factory No. 24 in October 1942 and Factory No. 45 in 1943. The engine did not pass State test until May 1943.
GAM-38F: A proposed marine version of the AM-38F.^[3]

Specifications (AM-38F)

Data from Kotelnikov.^[4]

General characteristics

Type: 12-cylinder 60° V aircraft piston engine
Bore: 160 mm (6.30 in)
Stroke: 190 mm (7.48 in) (196.7 mm (7.74 in) for cylinders with articulated connecting rods)
Displacement: 46.66 L (2,847 cu in)
Dry weight: 880 kg (1,940 lb)

Components

Supercharger: Single-speed geared centrifugal supercharger
Cooling system: Liquid-cooled

Performance

Power output: 1,270 kW (1,700 hp) at 2,350 rpm
Specific power: 27.2 kW/L (0.60 hp/in³)
Compression ratio: 6.0:1
Power-to-weight ratio: 1.53 kW/kg (0.93 hp/lb)

Applications

References

Notes

^ Gunston 1989, p.104.
^ Gordon, Yefim (1998). Soviet combat aircraft of the Second World War. Khazanov, Dmitriĭ. Leicester: Midland Pub. p. 74. ISBN 1857800834. OCLC 40494691.
^ ^a ^b Kotelnikov 2005, p. 111.
^ Kotelnikov 2005, p. 111.

Bibliography

Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
Kotelnikov, Vladimir. Russian Piston Aero Engines. Marlborough, Wiltshire. The Crowood Press Ltd. 2005. ISBN 1-86126-702-9.

[1] Gunston 1989, p.104.

[2] Gordon, Yefim (1998). Soviet combat aircraft of the Second World War. Khazanov, Dmitriĭ. Leicester: Midland Pub. p. 74. ISBN 1857800834. OCLC 40494691.

[:0-3] Kotelnikov 2005, p. 111.

[4] Kotelnikov 2005, p. 111.

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v t e Mikulin aircraft engines
Piston engines	M-17 AM-34 AM-35 AM-37 AM-38 AM-39 AM-42 AM-43 AM-44 AM-45 AM-46 AM-47
Turbojets	AM-2 AM-3 AM-5 AM-9