This phase can take 3 to 4 minutes (for a solid rocket shorter than for a liquid-propellant rocket), the altitude at the end of this phase is 150–200 km, and the typical burn-out speed is 7 km/s.
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In February 1973, State Rocket Center Makayev began development of a new two-stage liquid-fueled ballistic missile R-29R (3M40, RSM-50, SS-N-18).
There would be a choice of engines with different liquid rocket propellants: 1,200 kN thrust LOX/kerosene engines or 500 kN thrust LOX/LH2 engines on first stage and boosters.