Klimov M-103
Klimov M-103
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Klimov M-103

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Klimov M-103

The Klimov M-103 is a V12 liquid-cooled piston aircraft engine used by Soviet aircraft during World War II. Offering around 1,000 hp for takeoff, it was used in a fairly small number of designs, with its greatest success being the Tupolev SB. It was soon replaced by the more powerful 1,100 hp Klimov M-105, which arrived in late 1939. Production continued until 1942, by which time almost twelve thousand had been delivered.

The M-103 was a further development of the Klimov M-100 engine that was itself a licensed copy of the French Hispano-Suiza 12Ybrs. It differed from both engines in a number of aspects such as increased compression ratio, increased supercharger ratio, increased rpm's, strengthened cylinder blocks, a new crankshaft, a more aggressive camshaft, and flat bottomed cylinders. Developed in 1936 it was ready for testing in October 1936. The first two models failed testing due to cracked cylinder blocks and the engine was resubmitted for testing in 1937. After passing its trials it was cleared for production in 1938 and 11,681 were produced until 1942 at its factory in Rybinsk. The M-103 was followed by the M-105.

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