Charomskiy ACh-30 / M-30
The Charomskiy M-40 was a Soviet turbocharged aircraft diesel engine developed during World War II. It was used in a few Petlyakov Pe-8 heavy bombers until August 1941 when it was removed, because it was unreliable at high altitudes. The engines were stored until 1944 when they were disassembled and their components were used in the closely related Charomskiy ACh-30B.
The Charomskiy ACh-30 was a Soviet liquid-cooled V-12 turbo-supercharged diesel aircraft engine developed during World War II. The initial version was not very satisfactory and it was cancelled when its factory was forced to evacuate in the autumn of 1941. But production was reinitiated in the summer of 1942 and continued until September 1945 to meet the need for an economical engine to power the Soviet long-range bombers like the Petlyakov Pe-8 and the Yermolayev Yer-2.
The ACh-30 was a development of the experimental AN-1RTK turbo-supercharged diesel engine that had begun development in the early 1930s. It was initially designated as the AD-5 when development began in the sharashka attached to Factory (Zavod) No. 82 at Tushino Airport in 1939. Construction of the first five prototypes began at the end of that year and it passed its tests in early 1940. Preparations to begin series manufacture at Factory No. 82 began in May 1940, but actual production was delayed until 1941 when forty-four were built as the M-30. Production was planned to be transferred to the Kharkov Tractor Factory, but this was cancelled before any engines were built. The M-30 had proven to be unsatisfactory in service, as it was unreliable and troublesome at high altitudes and in cold conditions. Specific problems were its failure to deliver full rpms and it suffered from oil blowouts and failures of the oil pumps. Therefore production was cancelled when Factory No. 82 was forced to evacuate in the fall of 1941 because of the German advance on Moscow.
Versions of the ACh-30 were evaluated on the Ilyushin Il-6 and the ANT-67, a long-range version of the Tupolev Tu-2, but neither aircraft was put into production. It was also proposed for use on the Tupolev Tu-8S and the MN executive transport, but neither of those projects progressed past design proposal stage.