Shvetsov M-11

The Shvetsov M-11 is a five-cylinder air-cooled radial aircraft engine produced in the Soviet Union between 1923 and 1952.

Design and development
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. Like the American Kinner B-5 5-cylinder radial of similar size, the M-11 had individual camshafts for each cylinder, operating the pushrods, rather than a single central cam ring. The initial versions of the M-11 suffered from a short service life of only 50 hours. The basic M-11 engine had a power output of 100 hp (73 kW), the newer M-11D variant was higher at 125 hp (92 kW). The ultimate version, M-11FR, introduced in 1946, increased power 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.

Variants
Data from:
 * M-100: Designation of prototype and initial designs.
 * M-11:Initial production version at 100 hp, compression ratio 5:1
 * M-11a:100 hp / 110 hp
 * M-11/A:100 hp / 110 hp
 * M-11B:100 hp / 110 hp
 * M-11D:115 hp / 125 hp
 * M-11E:Compression ratio 6:1 - 150 hp / 160 hp
 * M-11F:145 hp / 165 hp
 * M-11FM:145 hp
 * M-11FR:Compression ratio 5.5:1 - 140 hp / 160 hp
 * M-11FR-1:Compression ratio 5.5:1 - 140 hp / 160 hp
 * M-11FN:200 hp
 * M-11G:100 hp / 110 hp
 * M-11I:Compression ratio 5.5:1 - 170 hp / 200 hp
 * M-11K:115 hp / 125 hp
 * M-11L:115 hp / 125 hp
 * M-11M:145 hp
 * M-11V:100 hp / 110 hp
 * M-11Ya:A projected development of the M-11 at GAZ-41. The prototype was run but results were unsatisfactory, re-designated M-12


 * M-11Ye:Developed by Okromechko 150 hp

Further developments

 * 3M-11: An alternative designation for the M-50 three cylinder derivative of the M-11
 * M-12: A 190 hp development of the M-11 by M.A. Kossov, un-related to the NAMI-100, which had been earlier designated M-12.
 * M-12 (M-11Ya):A projected development of the M-11 at GAZ-41. The prototype was run but results were unsatisfactory, re-designated from M-11Ya
 * M-13 (M-13K): A 1944 development by M.A. Kossov to be assembled from various M-11 variants
 * M-13: In parallel with the M-13K, E.V. Urmin at GAZ-41 mated cylinders from the M-11D with new crankshaft and crankcase
 * M-13: A later M-13 was created by I.A. Muzhilov at OKB-41 in 1946. Despite passing state acceptance test in June 1948, this engine was not put into production.
 * M-48:A 7-cylinder further development at GAZ-29 200 hp
 * M-49:A 9-cylinder further development at GAZ-29 270 hp / 310 hp
 * M-50:A 3-cylinder further development at GAZ-29 60 hp
 * M-51:A 5-cylinder further development at GAZ-29 125 hp / 145 hp
 * MG-11:Development of the M-51 at the NIIGVF (Nauchno-Issledovatel'skiy Institut Grazdahnskovo Vozdooshnovo Flota - civil air fleet scientific test institute) by M.A. Kossov. 150 hp / 180 hp
 * MG-21:Development of the M-48 at the NIIGVF by M.A. Kossov. 210 hp / 250 hp
 * MG-31:Development of the M-49 at the NIIGVF by M.A. Kossov. 270 hp / 320 hp
 * MG-50: A projected 18 cylinder, two-row radial derived from M-11 components by M.A. Kossov. 800 hp / 850 hp

Applications
The M-11 powered a number of Soviet, Bulgarian and Polish aircraft. The M-11 remained in production until 1952 with an estimated total of over 100,000 engines made. Several hundreds of M-11D and M-11FR-1 variants were manufactured under license in the Polish WSK-Kalisz works in Kalisz. It was also used for the up-engined GAZ-98K aerosani winter-used sled in a pusher configuration, and as the standard powerplant for the similar NKL-26 propeller-driven sledges during the World War II years.


 * Anbo II (replica)
 * Gribovsky G-15
 * Gribovsky G-20
 * Gribovsky G-21
 * Gribovsky G-23
 * Gribovsky G-27
 * Kharkiv KhAI-3
 * Laz-7M
 * LWD Junak
 * Mikoyan-Gurevich MiG-8 Utka
 * Polikarpov Po-2
 * PZL S-4 Kania
 * Shavrov_Sh-2 amphibian
 * Shcherbakov Shche-2
 * Yakovlev UT-1
 * Yakovlev UT-2
 * Yakovlev Yak-6
 * Yakovlev Yak-12
 * Yakovlev Yak-18