.jpg "NK-4 Turboprop engine © Konstantinos Panitsidis")
In numbers Through the lens Video
The NK-4 is a single-shaft turboprop engine, developed in the mid-1950s by the USSR to power the Il-18 and An-10 aircraft. Its design prioritizes lightweight construction, fuel efficiency, and simplicity, ensuring compatibility with the operational requirements of Soviet civilian and military aircraft at the time.
NK-4 Turbine Engine (Sectional View)
Despite its promising performance in flight tests, particularly with the Il-18, the NK-4 engine was discontinued due to an unspecified decision by the USSR's Military-Industrial Affairs Committee. This decision led to the replacement of the NK-4 by the AI-20 turboprop engine, developed by ZMKB Progress.
Design Features:
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| Six-stage axial compressor | Tubular-annular combustion chamber |
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| Three-stage turbine |
Constant-geometry jet nozzle |
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| Reduction Gear: The engine utilizes a one-stage planetary reduction gear with a 14:1 reduction ratio, which translates the high-speed turbine rotation to the lower-speed shaft needed to drive the propeller. |
NK-4 engines were installed on 27 Il-18 aircraft.
Technical specifications
| DESIGNER | Kuznetsov Design Buream |
| COUNTRY | Russia |
| TYPE |
Turboprop engine
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| Installed On (aerial means) |
Il-18, An-10
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| Fuel | - |
| Oil | - |
| Propeller shaft power, take-off power rating (H=0, M=0) | 4.000 h.p. |
| Specific fuel consumption, take-off power rating (H=0, M=0) | 0,245 kg/h.p.*h |
| Propeller shaft power, cruise power (H=8.000 m, M=0,57) | 2.150 h.p. |
| Specific fuel consumption, cruise power (H=8.000 m, M=0,57) | 0,210 kg/h.p.*h |
| Pressure ratio, take-take-off power rating | 7,7 (7,9) |
| Temperature of the gas at the turbine intake, take-off power rating | 1.250 K |
| Air flow rate, take-off power rating | 18,7 kg/sec |
| OVERALL DIMENSIONSΣ | |
| Diameter | 1050 mm |
| Height | - |
| Width | - |
| Length | 2770 mm |
| WEIGHT | |
| Engine weight | 970 kg |
| Specified service life | - |
Photos NK-4 Turboprop Engine
Video
NK-4 Turboprop Engine © Redstar.gr