Mikulin AM-34

The Mikulin AM-34 (M-34) was a Soviet mass-produced, liquid-cooled, aircraft engine. Before the war, the Russian aero engine industry was mainly engaged in producing engines of foreign design, notably Wright, Bristol, Hispano-Suiza, and Gnome-Rhône. Several engines of so-called original design have been developed, although these were probably largely based on foreign models. The M-34 was thought to have been originally designed in Italy by Fiat for the Russians; its design closely follows Italian in-line aero engine practice. Its initial development was troubled, but it eventually became one of the most successful Soviet aircraft engines of the 1930s. It was utilized on the Beriev MBR-2, Tupolev TB-3, Tupolev TB-4, Tupolev ANT-20, Petlyakov Pe-8, Kalinin K-7, Polikarpov I-17, and Bolkhovitinov DB-A aircraft as well as the G-5 and various prototype motor torpedo boats. A version of the maritime model was adapted for use in several prototype heavy tanks in 1939, although none were placed into production.