NK-25
Type	Turbofan
National origin	Soviet Union
Manufacturer	Kuznetsov Design Bureau
Major applications	Tupolev Tu-22M

The Kuznetsov NK-25 is a turbofan aircraft engine used in the Tupolev Tu-22M strategic bomber. It can equal the NK-321 engine as one of the most powerful supersonic engines in service today. It is rated at 245 kN (55,000 lbf) thrust. The three shaft engine we call the NK-25 was designed in the years 1972–1974. It is made by the Soviet Kuznetsov Design Bureau.

Applications

• Tupolev Tu-142LL^[1] (testbed)
• Tupolev Tu-22M3^[1]
• Tupolev Tu-22MR^[1]

Specifications (NK-25)

Data from motor-s.ru,^[2] Otechestvennaya aviatsionno-kosmicheskaya tekhnika - SAMARSKIY NTK^[1] and engine.aviaport.ru^[3]

General characteristics

• Type: Three-spool low-bypass afterburning turbofan
• Length: 7,300 mm (290 in)^[2]
• Diameter: 1,770 mm (70 in)^[2] at the nozzle casing
• Dry weight: 3,575 kg (7,882 lb)^[2]

Components

• Compressor: 3-stage LP, 5-stage IP and 7-stage HP^[3]
• Combustors: Annular multi-nozzle combustion chamber^[2]
• Turbine: 4-stage axial turbine^[2]

Performance

• Maximum thrust:
  
  • 245 kN (55,000 lbf)^[1] wet
  • 145 kN (33,000 lbf)^[2] dry
• Overall pressure ratio: 25.9^[3]
• Bypass ratio: 1.45^[2]
• Air mass flow: 211 kg/s (470 lb/s)
• Turbine inlet temperature: 1,597 K (1,324 °C; 2,415 °F)^[3]
• Specific fuel consumption:
  
  • 2.1 kg/(kgf⋅h)^[2] wet
  • 0.58 kg/(kgf⋅h)^[2] dry
• Thrust-to-weight ratio: 6.99 kgf/kg (31.1 N/lb)