The Charomskiy M-40 was a

Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...

turbocharged In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

aircraft diesel engine An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. C ...

developed during World War II. It was used in a few

Petlyakov Pe-8 The Petlyakov Pe-8 (russian: Петляков Пе-8) was a Soviet heavy bomber designed before World War II, and the only four-engine bomber the USSR built during the war. Produced in limited numbers, it was used to bomb Berlin in August 1941. ...

heavy bomber Heavy bombers are bomber aircraft capable of delivering the largest payload of air-to-ground weaponry (usually bombs) and longest range (takeoff to landing) of their era. Archetypal heavy bombers have therefore usually been among the larges ...

s until August 1941 when it was removed, because it was unreliable at high altitudes. The engines were stored until 1944 when they were disassembled and their components were used in the closely related

Charomskiy ACh-30 The Charomskiy ACh-30 was a Soviet aircraft diesel engine developed during World War II. The initial version was not very satisfactory and it was cancelled when its factory was forced to evacuate in the autumn of 1941. Production was reinitiated i ...

Development

Much like the

, the M-40 was a development of the experimental AN-1RTK turbo-supercharged diesel engine that had begun development in the early 1930s. It dropped its predecessor's supercharger, but added another two E-88 turbochargers and two

intercooler An intercooler is a heat exchanger used to cool a gas after compression. Often found in turbocharged engines, intercoolers are also used in air compressors, air conditioners, refrigeration and gas turbines. Internal combustion engines Mo ...

s. It failed its State acceptance testing in May 1940, but production began regardless at the Kirov factory in

Leningrad Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), i ...

which built 58 engines in the first half of 1941. Production ceased in the Fall after a total of 120 engines were finished. Delivery problems with the

Mikulin AM-34 The Mikulin AM-34 (M-34) was a Soviet mass-produced, liquid-cooled, aircraft engine of domestic design. Its initial development was troubled, but it eventually became one of the most successful Soviet aircraft engines of the 1930s. It was utilize ...

FRNV forced the termination of the production of the

for lack of suitable engines in 1940, but the M-40 was adapted for use on the Pe-8 in the spring of 1941. However the M-40 tended to "cut out at high altitude because the manually controlled fuel feed depended on a certain engine speed being maintained and it could only be restarted at about ". In August 1941 the M-40s were removed from the few Pe-8s that had received them and placed into storage. In 1944 Factory No. 500 began to disassemble them in order to use their components in the closely related Charomskiy ACh-30B engine.Kotelnikov, p. 179 A boosted version, the M-40F, was tested in the Summer of 1940 and was approved for production the following November, although only a small batch was built in 1941. It was evaluated in a

Yermolaev Yer-2 The Yermolayev Yer-2 (russian: Ермолаев Ер-2) was a long-range Soviet medium bomber used during World War II. It was developed from the Bartini Stal-7 prototype airliner before the war. It was used to bomb Berlin from airbases in Eston ...

during 1941, but not accepted for use.

Variants

* M-40 — main production version * M-40F — boosted version, Power: , Weight:

Applications

* KV-4 Heavy Tank design proposals

Specifications

References

Notes

Bibliography

* {{Charomskiy Engines Aircraft diesel engines Soviet and Russian aircraft engines 1940s aircraft piston engines