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.