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 AmericanKinner 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, the newer M-11D variant was higher at 125 hp. 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 and featured a floatless carburetor.
Variants
Data from: ;M-100: Designation of prototype and initial designs. ;M-11:Initial production version at, compression ratio 5:1 ;M-11a: / ;M-11/A: / ;M-11B: / ;M-11D: / ;M-11E:Compression ratio 6:1 - / ;M-11F: / ;M-11FM: ;M-11FR:Compression ratio 5.5:1 - / ;M-11FR-1:Compression ratio 5.5:1 - / ;M-11FN: ;M-11G: / ;M-11I:Compression ratio 5.5:1 - / ;M-11K: / ;M-11L: / ;M-11M: ;M-11V: / ;M-11Ye:Developed by Okromechko
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 :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 : 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 ;M-49:A 9-cylinder further development at GAZ-29 / ;M-50:A 3-cylinder further development at GAZ-29 ;M-51:A 5-cylinder further development at GAZ-29 / ;MG-11:Development of the M-51 at the NIIGVF by M.A. Kossov. / ;MG-21:Development of the M-48 at the NIIGVF by M.A. Kossov. / ;MG-31:Development of the M-49 at the NIIGVF by M.A. Kossov. / ;MG-50: A projected 18 cylinder, two-row radial derived from M-11 components by M.A. Kossov. /
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-98Kaerosani 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.
