Glushko LOx/Kerosene rocket engine. Energia strap-on. Developed 1973-1985. First flight 1987. Used one-plane gimballing versus the two-plane gimballing required on the RD-171 of the Zenit launch vehicle. Designed for 10 reuses. AKA: 11D520. Status: Development ended 1976. Date: 1981-93. Number: 12 . Thrust: 7,903.00 kN (1,776,665 lbf).