Glushko N2O4/UDMH rocket engine. N-1 upper stage, UR-700 stage 3. Proposed for use in N-1. High altitude version of RD-253 for 2nd stages. Later proposed for R-56 and UR-700 upper stages.
Status: Study 1961. Date: 1962-66. Thrust: 1,716.00 kN (385,772 lbf).