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KLIMOV VK-107

The Klimov VK-107 was a V-12 liquid-cooled piston aircraft engine that was a brand-new design having little in common with its predecessors M-105 and VK-106. To achieve a greater power output, each cylinder now had four valves (two intake and two exhaust), crankshaft and camshafts were completely revised, and a new supercharger design was implemented. Although the engine could have been ready for production as early as 1942, Soviet factories lacked the capacity to produce a brand new design. Thus, less powerful VK-105PF and VK-105PF2 were built instead. However, the appearance of Luftwaffe Messerschmitt Bf 109G with Daimler-Benz DB 605 engine in 1943 created an urgent demand for a more powerful engine. VK-107A was put into production in 1944 and was used on Yak-9U fighters. The engine was not well liked by either pilots or mechanics – it had a life expectancy of only 25 hours and war emergency power was almost never used for fear of decreasing this even more. The engine was also difficult to service, in part because its exhaust headers were on the inside of the cylinder banks, the reverse placement of most V-type liquid-cooled engine designs.


Manufacturer: Klimov
First Run: 1942
Number built: N/A

General Characteristics: VK-107A
Type: 12-cylinder supercharged liquid-cooled Vee aircraft piston engine
Bore: 148mm (5.83in)
Stroke: 170mm (6.69in)
Displacement: 35.08 liters (2,140 in³)
Dry weight: 765 kg (1,685 lb)

Components:
Valvetrain: Two intake and two exhaust valves per cylinder actuated via an overhead camshaft
Supercharger: Single stage, two-speed, gear-driven centrifugal type supercharger
Cooling system: Liquid-cooled

Performance:
Power output:
   1,650 hp at 3,200 rpm for takeoff
   1,450 hp at 2,800 m (12,500 ft)
Specific power: 35.1 kW/L (0.77 hp/in³)
Compression ratio: 6.75:1
Power-to-weight ratio: 1.61 kW/kg (0.98 hp/lb)


Variants:
VK-107A – production version

VK-107R – version for hybrid piston-motorjet powered Mikoyan-Gurevich I-250 (N) and Sukhoi Su-5 fighters

VK-108 – an attempt to further develop VK-107 with 1,380 kW (1,850 hp) on takeoff, used on several Yakovlev Yak-3 prototypes but did not enter production.


Applications:
– Mikoyan-Gurevich MiG-7
– Petlyakov Pe-2
– Yakovlev Yak-3
– Yakovlev Yak-9

Sources:
Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.
Wikipedia

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