NK-8-4 Turbofan engine

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The NK-8-4 was a further development of the NK-8 engine and was distinguished by its increased thrust. Serial production was carried out from 1964 to 1979 at JSC KMPO (Kazan Motor-Building Production Association) in Kazan.

The NK-8-4 is a twin-spool turbofan engine. Its design incorporates a two-stage fan and a two-stage low-pressure compressor (LPC) mounted on a common shaft, a six-stage high-pressure compressor (HPC), an annular combustion chamber, a single-stage high-pressure turbine (HPT), a two-stage low-pressure turbine (LPT), and an exhaust system. The latter consists of a thrust reverser - except on the earliest production versions - and an exhaust nozzle.

The engine entered operational service in 1965, powering the Ilyushin Il-62 passenger airliners operated by Aeroflot. Owing to its reliability and improved performance, it became one of the most important Soviet commercial aircraft engines of the 1960s and 1970s.

A specialized variant, designated NK-8-4K, was subsequently developed from the NK-8-4 to power the A-90 Orlyonok ground-effect vehicle. This version was adapted to meet the unique operational requirements of ekranoplans while retaining the principal features of the original engine.

Technical Characteristics
Type: Twin-spool turbofan engine  Fan: 2 stages  Low-Pressure Compressor (LPC): 2 stages  High-Pressure Compressor (HPC): 6 stages  Combustion Chamber: Annular  High-Pressure Turbine (HPT): 1 stage  Low-Pressure Turbine (LPT): 2 stages.

Technical specifications