The Mikulin M-17 is a Soviet liquid-cooled V12 engine that was developed by the Aleksandr Mikulin in the 1930s. It is based on the German BMW VI engine, for which the NKVD was able to acquire full blueprints thanks to KPD infiltrators. The M-17 engine was used by various Soviet aircraft and tanks during World War II, such as the Tupolev TB-3, the Polikarpov R-5, and the Beriev MBR-2. It has a displacement of 46.9 litres and can produce up to 680 hp at 1,600 rpm. The M-17 engine is the direct predecessor of the Mikulin AM family of engines, including the Mikulin AM-38.