Shvetsov M-11 Explained

The Shvetsov M-11 is a five-cylinder air-cooled radial aircraft engine produced in the Soviet Union between 1923 and 1952.[1]

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:[2]

M-100: Designation of prototype and initial designs.
  • M-11:Initial production version at 100abbr=onNaNabbr=on, compression ratio 5:1
  • M-11a:100abbr=onNaNabbr=on / 110abbr=onNaNabbr=on
  • M-11/A:100abbr=onNaNabbr=on / 110abbr=onNaNabbr=on
  • M-11B:100abbr=onNaNabbr=on / 110abbr=onNaNabbr=on
  • M-11D:115abbr=onNaNabbr=on / 125abbr=onNaNabbr=on
  • M-11E:Compression ratio 6:1 - 150abbr=onNaNabbr=on / 160abbr=onNaNabbr=on
  • M-11F:145abbr=onNaNabbr=on / 165abbr=onNaNabbr=on
  • M-11FM:145abbr=onNaNabbr=on
  • M-11FR:Compression ratio 5.5:1 - 140abbr=onNaNabbr=on / 160abbr=onNaNabbr=on
  • M-11FR-1:Compression ratio 5.5:1 - 140abbr=onNaNabbr=on / 160abbr=onNaNabbr=on
  • M-11FN:200abbr=onNaNabbr=on
  • M-11G:100abbr=onNaNabbr=on / 110abbr=onNaNabbr=on
  • M-11I:Compression ratio 5.5:1 - 170abbr=onNaNabbr=on / 200abbr=onNaNabbr=on
  • M-11K:115abbr=onNaNabbr=on / 125abbr=onNaNabbr=on
  • M-11L:115abbr=onNaNabbr=on / 125abbr=onNaNabbr=on
  • M-11M:145abbr=onNaNabbr=on
  • M-11V:100abbr=onNaNabbr=on / 110abbr=onNaNabbr=on
  • 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 150abbr=onNaNabbr=on

    Further developments

    3M-11: An alternative designation for the M-50 three cylinder derivative of the M-11
  • M-12: A 190hp 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 200abbr=onNaNabbr=on
    M-49
  • A 9-cylinder further development at GAZ-29 270abbr=onNaNabbr=on / 310abbr=onNaNabbr=on
    M-50
  • A 3-cylinder further development at GAZ-29 60abbr=onNaNabbr=on
    M-51
  • A 5-cylinder further development at GAZ-29 125abbr=onNaNabbr=on / 145abbr=onNaNabbr=on
    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. 150abbr=onNaNabbr=on / 180abbr=onNaNabbr=on
    MG-21
  • Development of the M-48 at the NIIGVF by M.A. Kossov. 210abbr=onNaNabbr=on / 250abbr=onNaNabbr=on
    MG-31
  • Development of the M-49 at the NIIGVF by M.A. Kossov. 270abbr=onNaNabbr=on / 320abbr=onNaNabbr=on
    MG-50
  • A projected 18 cylinder, two-row radial derived from M-11 components by M.A. Kossov. 800abbr=onNaNabbr=on / 850abbr=onNaNabbr=on

    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.

    References

    Bibliography

    Notes and References

    1. Gunston 1989, p.158.
    2. Book: Kotelnikov, Vladimir . Russian Piston Aero Engines . 2005 . The Crowood Press Ltd. . Marlborough . 978-1-86126-702-3.

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