The Tumansky M-90 was a prototype Soviet radial engine designed before World War II. It proved unreliable and incapable of reaching its designed output and was cancelled in 1944. == Development == The M-90 began development in the spring of 1939 under the leadership of S. K. Tumansky as a coupled version of the 9-cylinder Gnome-Rhône 9K, which was built under license as the M-75.
The Tumansky M-90 was a prototype Soviet radial engine designed before World War II. It proved unreliable and incapable of reaching its designed output and was cancelled in 1944. == Development == The M-90 began development in the spring of 1939 under the leadership of S. K. Tumansky as a coupled version of the 9-cylinder Gnome-Rhône 9K, which was built under license as the M-75.
Source: Wikipedia "Tumansky M-90" · CC BY-SA 4.0
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