Tumansky M-87
{{Short description|1930s Soviet aircraft piston engine}}
{{More citations needed|date=June 2019}}
| {{Infobox Aircraft Begin
|name= M-87 |image = |caption = }} {{Infobox Aircraft Engine |type= Radial aero engine |national origin = Soviet Union |manufacturer= Tumansky |first run=1938 |major applications= |number built = |program cost = |unit cost = |developed from = |developed into = Tumansky M-88 |variants with their own articles = }} |
The Tumansky M-87 was a Soviet air-cooled aircraft radial engine 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.{{cite web |title=DB-3 |work=Airpages.ru |url=http://www.airpages.ru/cgi-bin/pg.pl?nav=ru20&page=il3 |accessdate=2007-01-08}} The engine was subsequently modified to M-86 which produced 960 hp (715 kW) at takeoff thanks to increased supercharging and a higher compression ratio. 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 bombers, and the Polikarpov I-180 fighter.
Specifications (M-87)
{{pistonspecs|
|type=Two-row, 14-cylinder, air-cooled supercharged radial engine
|bore=146 mm (5.748 in)
|stroke=165 mm (6.496 in)
|displacement=38.673 L (2,360 in³)
|length=
|diameter=
|width=
|height=
|weight=640 kg (1,140 lb)
|valvetrain=
|supercharger=Centrifugal type supercharger
|turbocharger=
|fuelsystem=
|fueltype=
|oilsystem=
|coolingsystem=air
|power=950 hp (710 kW) at 2,250 rpm for takeoff and at 4,500 m (14,765 ft)
|specpower=18.4 kW/L (0.4 hp/in³)
|compression=6.1:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=1.1 kW/kg (0.8 hp/lb)
}}
See also
{{Aircontent
|related=
|similar engines=
|lists=
|see also=
}}
References
{{Reflist}}
{{Tumansky aeroengines}}
Category:1930s aircraft piston engines