High Quality Content by WIKIPEDIA articles! The Lyulka AL-21 is an axial flow turbojet engine created by the Soviet company named for its chief designer Arkhip Mikhailovich Lyulka. AL-21 entered service in the early 1960s. With later marks AL-21F3 it was used in the Sukhoi Su-17, Sukhoi Su-24, early Mikoyan-Gurevich MiG-23, and Sukhoi T-10 (Sukhoi Su-27 prototype). A non-afterburning version powered the Yakovlev Yak-38 VTOL fighter.