The Tumansky M-87 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, ...

air-cooled aircraft

radial engine The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is ca ...

that was developed in the late 1930s. It was a development of their licensed Gnome-Rhone 14K engines that started with the M-85.

Development

In 1934, USSR licensed the French Gnome-Rhone 14K aircraft engine producing 800 hp (595 kW), which entered production as the M-85. The engine was subsequently modified to M-86 which produced 960 hp (715 kW) at takeoff thanks to increased

supercharging In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement. The current categorisation is that a supercharger is a form of forced induc ...

and a higher

compression ratio The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

. The M-87 was created to further increase the power output. Cylinders and pistons were revised to increase the compression ratio and the supercharger was redesigned. The resulting engine had better high-altitude performance and entered production in 1938. However, the engine proved unreliable and suffered from failure of gears in the reduction gearbox. Later the M-88 was designed to address the shortcomings of the M-87. At first the M-88 was not a success, but the designers persisted, and the M-88 was made into a reliable and widely produced engine. The M-87 was used in Ilyushin Il-4 and

Sukhoi Su-2 The Sukhoi Su-2 (russian: Сухой Су-2) was a Soviet reconnaissance and light bomber aircraft used in the early stages of World War II. It was the first airplane designed by Pavel Sukhoi. The basic design received an engine and armament up ...

bombers, and the

Polikarpov I-180 The Polikarpov I-180 (russian: И-180) was a 1938 Soviet Union, Soviet fighter aircraft, fighter prototype. It was the last attempt to extract performance from the basic Polikarpov I-16 design.Green 1973, p. 165. The development cycle was plagued ...

fighter.

Specifications (M-87)

References

{{Tumansky aeroengines 1930s aircraft piston engines Aircraft air-cooled radial piston engines Tumansky aircraft engines

Development

Specifications (M-87)

See also

References