Isayev LOx/LH2 rocket engine. Originally developed for Proton and Angara upper stage KVRB with planned first flight 1995. Finally flown on 12KRB upper stage for India's GSLV. First flight 2001.
AKA: 11D56M;KVD-1M. Status: In development. Date: 1994-. Number: 4 . Thrust: 73.58 kN (16,541 lbf). Specific impulse: 461 s.