.jpg "Progress, Propfan D-27 © Konstantinos Panitsidis")
Photos from the personal collection of Konstantinos Panitsidis
Technical specifications 
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This engine is mainly intended for the Antonov, An-70, An-70T, An-180 and Beriev Be-42 aircraft, but also for aircraft with a low fuel consumption requirement, such as passenger aircraft.
The Progress D-27 Propfan turboprop engine has a contra-rotating propellers, SV-27 type variable pitch propellers of Russian origin and made entirely of composite materialы with a diameter of 4.5 meters.
Its front row is equipped with eight propellers and the rear row has six. All this combination yields a maximum power of 14,000 horsepower (each engine). In addition to these, the engine has the lowest fuel consumption (130 grams for every ton of cargo per kilometer).
Diameter of contra-rotating propellers 4500 mm. Rotational frequency take-off condition 1000 RPM. Weight 1100 kg. Take-off power 13400 h.p. Thrust (Vfl=0) 12150 kgf.
The design parameters (characteristics) of the D-27 have:
parameter stability ( very low fuel consumption in all operating phases high reliability)
reliability
long service life
low labor intensity of manufacturing and maintenance
low emission of pollutants
permissible noise level
TECHNICAL SPECIFICATIONS
| Fuel (Aviation grade kerosene) | RT |
| Oil | - |
| Propeller shaft power, take-off power rating | 14.000 e.h.p. |
| Specific fuel consumption, take-off power rating | 0,170 kg/e.h.p.*h |
| Propeller shaft power, cruise power | 6.750 e.h.p |
| Specific fuel consumption, cruise power (H=11.000 m, M=0,7) | 0,130 kg/e.h.p.*h |
| Pressure ratio, take-take-off power rating | 22,9 |
| Pressure ratio, cruise power | 29,7 |
| Temperature of the gas at the turbine intake, take-off power rating | 1.640 K |
| Temperature of the gas at the turbine intake, cruise power | 1.450 K |
| Air flow rate, take-off power rating | 27,7 kg/s |
| Air flow rate, cruise power | 24,4 kg/s |
| Air flow rate, cruise power maximum | 12,1 kg/s |
| Compressor rotation frequency low-pressure, take-off power rating | - |
| The rotational speed of the propfan turbine take-off mode | 8.934 rpm |
| Power-weight ratio | 8,485 h.p/kgf |
| Energy conversion efficiency (Mf=0) | 0,9 |
| Diameter propellers | 4500 mm |
| Weight (without the non-rotating propellers, high distortion) | 1.650 kg |
| Lenght | 4198 mm |
| Height | 1370 mm |
| Width | 1260 mm |
| Engine diameter | 1370 mm |
| Specified service life | 18000 h |
| Overhaul operation time (TBO) | 6000 h |
