Shvetsov M-11

The Shvetsov M-11 was designed under a 1923 competition in the Soviet Union for a new engine to power trainer aircraft. It is a single-row five-cylinder air-cooled radial piston engine with aluminum cylinder heads. Uniquely, pushrods actuating the valves were driven by individual cams on each cylinder rather than a single central cam. The initial versions of the M-11 suffered from a short service life of only 50 hours. Basic M-11 engine had power output 100 hp (73 kW), newer variant M-11D - 125 hp (92 kW). The ultimate version, M-11FR, introduced in 1946, increased output to 160 hp at 1,900 rpm on takeoff and 140 hp at cruise and had provisions for a variable-pitch propeller, accessory drive (for vacuum pumps, compressors, generators, etc.) and featured a floatless carburetor.

M-11 powered a number of aircraft, including Polikarpov Po-2, Yakovlev UT-1, Yakovlev UT-2, Yakovlev Yak-6, Yakovlev Yak-12, Yakovlev Yak-18 and Mikoyan-Gurevich MiG-8. It also powered the Polish LWD Junak and PZL S-4 Kania. M-11 remained in production until 1952 with an estimated total of over 100,000 engines made. Several hundreds were manufactured under license in Polish WSK-Kalisz works in Kalisz (M-11D and M-11FR-1).

pecifications (M-11)


type=5-cylinder air-cooled radial engine
bore=125mm (4.92 in)
stroke=140mm (5.51 in)
displacement=8.6 L (525 in³)
weight=165 kg (363 lb)
*82 kW (110 hp) at 1,650 rpm for takeoff
*75 kW (100 hp) cruise
specpower=9.5 kW/L (0.21 hp/in³)
power/weight=0.50 kW/kg (0.30 hp/lb)

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