Engine Model: NK-35. Designer: Kuznetsov. Developed in: 1972. Propellants: Lox/LH2. Thrust(vac): 1,960.000 kN (440,620 lbf). Chambers: 1. Country: Russia. Status: Design 1972. The NK-15VM was a derivative of the NK-15 with kerosene replaced by hydrogen. The engine was canceled before hot-tests. The design was updated and proposed for the UR-700M Mars booster in 1972, but this was not approved either.
Bibliography:- Yeteyev, Ivan, Operezhaya vremya, Ocherki, Moscow, 1999..