Shvetsov M 11

Updated on Nov 27, 2024

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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 75 kW (100 hp), compression ratio 5:1

M-11a

75 kW (100 hp) / 82 kW (110 hp)

M-11/A

75 kW (100 hp) / 82 kW (110 hp)

M-11B

75 kW (100 hp) / 82 kW (110 hp)

M-11D

86 kW (115 hp) / 93 kW (125 hp)

M-11E

Compression ratio 6:1 - 110 kW (150 hp) / 120 kW (160 hp)

M-11F

108 kW (145 hp) / 123 kW (165 hp)

M-11FM

108 kW (145 hp)

M-11FR

Compression ratio 5.5:1 - 100 kW (140 hp) / 120 kW (160 hp)

M-11FR-1

Compression ratio 5.5:1 - 100 kW (140 hp) / 120 kW (160 hp)

M-11FN

150 kW (200 hp)

M-11G

75 kW (100 hp) / 82 kW (110 hp)

M-11I

Compression ratio 5.5:1 - 130 kW (170 hp) / 150 kW (200 hp)

M-11K

86 kW (115 hp) / 93 kW (125 hp)

M-11L

86 kW (115 hp) / 93 kW (125 hp)

M-11M

108 kW (145 hp)

M-11V

75 kW (100 hp) / 82 kW (110 hp)M-11Ya:A projected development of the M-11 at GAZ-41. The prototpye was run but results were unsatisfactory, re-designated M-12

M-11Ye

Developed by Okromechko 110 kW (150 hp)

Further developments

3M-11

An alternative designation for the M-50 three cylinder derivative of the M-11

M-12

A 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 prototpye 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-29 150 kW (200 hp)

M-49

A 9-cylinder further development at GAZ-29 200 kW (270 hp) / 230 kW (310 hp)

M-50

A 3-cylinder further development at GAZ-29 45 kW (60 hp)

M-51

A 5-cylinder further development at GAZ-29 93 kW (125 hp) / 108 kW (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. 110 kW (150 hp) / 130 kW (180 hp)

MG-21

Development of the M-48 at the NIIGVF by M.A. Kossov. 160 kW (210 hp) / 190 kW (250 hp)

MG-31

Development of the M-49 at the NIIGVF by M.A. Kossov. 200 kW (270 hp) / 240 kW (320 hp)

MG-50

A projected 18 cylinder, two-row radial derived from M-11 components by M.A. Kossov. 600 kW (800 hp) / 630 kW (850 hp)

Applications

The M-11 powered a number of Russian, 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 (as airboats use today), and as the standard powerplant for the similar NKL-26 propeller-driven sledges during the World War II years.