Lyulka AL-7

The Lyulka AL-7 is a Soviet turbojet engine designed by Arkhip Mikhailovich Lyulka and produced by his Lyulka design bureau between 1954 and 1970. It was the first Soviet jet engine to have supersonic airflow through the first stage of the compressor. The AL-7 was initially intended for the Ilyushin Il-54 bomber, but later used for various Sukhoi, Tupolev, and Beriev aircraft, such as the Su-7B, Su-9, Su-11, Tu-28, and Be-10. This engine had a single-spool axial compressor with nine stages, an annular combustion chamber, and a two-stage turbine. Its more advanced model, the Lyulka AL-7F, also had an afterburner that increased the thrust by about 50%. The engine could produce a maximum thrust of 98.1 kN with afterburner and 67.1 kN at cruise thrust.