The Soloviev D-25V is a Soviet gas-turbine turboshaft engine for use in large helicopters. Designed and originally manufactured by the Soloviev Design Bureau the engine has been in production since May 1960. The power unit consists of two engines coupled to a gearbox weighing 3,200 kg (7,050 lb).
The V in the designation means vertoletny (Russian: Вертолетный), for helicopters.
D-25VStandard helicopter use production engines
D-25VFAdditional compressor zero-stage, power output 6,500 hp (4,847 kW)
D-25VKA combined propeller and shaft output engine for the
Kamov Ka-22 developing 5,500 hp (4,101 kW)
Mi-6 helicopterMi-10 helicopterMi-10K "flying crane" helicopterMi-12 helicopterKamov Ka-22 Compound helicopterData from Gunston and Jane's.
Type: Free-turbine single-shaft turboshaft engineLength: 273.7 cm (107.75 in)Diameter: 108.6 cm (42.8 in) (width) 115.8 cm (45.6 in) (height)Dry weight: 1,325 kg (2,921 lb)Compressor: Nine-stage axial flowCombustors: 12-chamber cannularTurbine: Single-stage compressor turbine, two-stage power turbineFuel type: AvturMaximum power output: 5,500 hpSpecific fuel consumption: 0.639 lb/shp/hrPower-to-weight ratio: 