Klimov VK-106

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Klimov VK-106 is an experimental V-12 liquid-cooled piston aircraft engine intended for Soviet aircraft during World War II.

[edit] Development

With VK-105PF2 exhausting the potential of the M-105, Klimov designed a new VK-106 engine in 1943. Since air combat on the Eastern Front took place primarily at medium altitudes (under 4,000 m (13,000 ft)), the new engine was built specifically for peak performance at those altitudes with a reduced compression ratio and a single-speed supercharger. Although reliable and easily installed in M-105-powered aircraft, VK-106 did not enter production because it differed from M-105 enough to require new tooling and Soviet engine factories at the time lacked the capacity to produce another design. Like M-105P, VK-106P could house an autocannon in the "vee" between the cylinder blocks.

[edit] Specifications (VK-106P)

General characteristics

Type: 12-cylinder supercharged liquid-cooled Vee piston aircraft engine
Bore:
Stroke:
Displacement: 35.0 liters (2,135 in³)
Dry weight: 600 kg (1,320 lb)

Components

Supercharger: Gear-driven single-stage single-speed centrifugal type supercharger
Fuel type: 95-octane rating gasoline
Cooling system: Liquid-cooled

Performance

Power output:
- 1,007 kW (1,350 hp) at 2,600 rpm for takeoff
- 1,007 kW (1,350 hp) at 2,000 m (6,560 ft)
Specific power: 28.8 kW/L (0.63 hp/in³)
Compression ratio: 6.5:1
Power-to-weight ratio: 1.68 kW/kg (1.02 hp/lb)