Kuznetsov NK-89

The Kuznetsov NK-89 was an experimental alternative fuel turbofan engine, designed by the Kuznetsov Design Bureau.

NK-89
Type	Turbofan
National origin	Soviet Union
Manufacturer	Kuznetsov Design Bureau
First run	1989[1]
Major applications	Tupolev Tu-155 Tupolev Tu-156[2]
Developed from	NK-88

Development

The NK-89 was a modified version of the hydrogen-powered NK-88^[1] and was designed to run on both liquified natural gas^[2] (LNG) and kerosene.^[2] It was intended for use on the proposed Tupolev Tu-156,^[2] a modified version of the Tupolev Tu-154B.^[2] This aircraft was to have cryogenic tanks in the rear of the cabin and forward baggage hold to store the LNG.^[2] Kerosene would be carried in the wing tanks.^[2] In January 1989, a test flight of a prototype of this engine was carried out onboard of the Tupolev Tu-155 flying laboratory where LNG was used as fuel.^[1]

By default, the engine would run on LNG,^[2] but kerosene could be used when flying out of airports where LNG is unavailable^[2] or in case of emergency.^[2] The switch from LNG to kerosene could be made in-flight in 5 seconds.^[2]

Applications

• Tupolev Tu-155 (testbed)
• Tupolev Tu-156M^[2] (proposed)
• Tupolev Tu-156S^[2] (proposed)

Specifications (NK-89)

Data from Otechestvennaya aviatsionno-kosmicheskaya tekhnika - SAMARSKIY NTK^[1] and janes.migavia.com^[2]

General characteristics

• Type: Two-spool alternative fuel turbofan
• Length:
• Diameter:
• Dry weight:

Components

• Compressor:
• Fuel type: LNG^[1][2] or kerosene^[2]

Performance

• Maximum thrust: 103 kN (23,000 lbf)^[1]
• Specific fuel consumption: 75.2 kg/(kN·h)^[1] in cruise on LNG

See also

Comparable engines

• Kuznetsov NK-88
• Reaction Engines Scimitar

Related lists

• List of aircraft engines