A radial engine with direct fuel injection into the cylinders. Designed by a team led by A. Shvetsov. It was series-produced after World War II in the USSR and under licence in Czechoslovakia under the designation M-21. It was used in, among others, the Yakovlev Yak-11 and Tupolev UTB aircraft.
| Configuration | 7-cylinder radial |
| Cooling | air |
| Compression ratio | 6.4 |
| Displacement | 20.6 l |
| Weight | 495 kg |
| Maximum power | 700 hp at 2500 rpm |
| Rated power | 570 hp at 2350 rpm |
