Soviet version of the Wright Cyclone SGR-1820 F3, take-off power of 536 kW (730 hp). It was used to drive the two-seater Polikarpov UTI-4 (Polikarpov I-16 type 15), which was based on a single-seater machine Polikarpov I-16 type 5.
Source: Šnajdr, Miroslav: Polikarpov UTI-4; Military Revue No. 2012/02
Source: Šnajdr, Miroslav: Polikarpov UTI-4; Military Revue No. 2012/02