# 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 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 prototype 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 190 hp (140 kW) 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-29 150 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 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
* Tsybin Ts-25M
* Yakovlev UT-1
* Yakovlev UT-2
* Yakovlev Yak-6
* Yakovlev Yak-12
* Yakovlev Yak-18

## Specifications (M-11A)

Data from Kotelnikov.

### General characteristics

* Type: 5-cylinder air-cooled radial engine
* Bore: 125 mm (4.92 in)
* Stroke: 140 mm (5.51 in)
* Displacement: 8.6 L (525 in$^3$)
* Dry weight: 165 kg (363 lb)

### Components

* Cooling system: Air-cooled

### Performance

* Power output:
* 82 kW (110 hp) at 1,650 rpm for takeoff
* 75 kW (100 hp) cruise
* Specific power: 9.5 kW/L (0.21 hp/in$^3$)
* Compression ratio: 5:1
* Power-to-weight ratio: 0.5 kW/kg (0.3 hp/lb)