History Construction List

Suchoj Su-20 2019.

235 Section 1974-04-26

OKB Suchoj Su-20

Poland

Construction

Engine AL-21

The AL-21 engine consists of a 14-stage axial compressor, annular-tube combustion chamber, 3-stage turbine, afterburner and adjustable discharge nozzle. Compressor 14.5. The maximum temperature in front of the turbine is 1 097 degrees C. The engine is cooled by air drawn by 4 catches located on the fuselage in the rear. Engine length 5.34 m. Maximum diameter 1.03 m. Engine weight 1 800 kg. The fuel is kerosene: T-1, TS-1, RT. Oil IPM-10 or synthetic WNII-50. Specific fuel consumption 0.9 - 1.2 kg / daN / h, with afterburning 1.5 - 2.0 kg / daN / h. The engine's service life is 900 - 1,500 hours, depending on the production series. Repair period 350 - 450 hours.

The A. Lulka AL-21 engine was used to propel Su-17, Su-20, Su-22 aircraft. Depending on the customer's wishes, Su-22 aircraft are equipped with an AL-21 or R-29 engine. All Polish Su-22 aircraft were equipped with AL-21 engines, the same ones that powered Su-20 aircraft. These engines are under renovation in Poland in Warsaw.

AL-21 engine. 2017. Photo by Karol Placha Hetman
AL-21 engine. 2017. Photo by Karol Placha Hetman

AL-21 engine. 2017. Photo by Karol Placha Hetman
AL-21 engine. 2017. Photo by Karol Placha Hetman

AL-21 engine. 2017. Photo by Karol Placha Hetman
AL-21 engine. 2017. Photo by Karol Placha Hetman

AL-21 engine. 2017. Photo by Karol Placha Hetman
AL-21 engine. 2017. Photo by Karol Placha Hetman

AL-21 engine. 2017. Photo by Karol Placha Hetman
AL-21 engine. 2017. Photo by Karol Placha Hetman

Written by Karol Placha Hetman