The first stage which was used to accelerate the missile
at launch used a Kartukov PRD-18 solid rocket powerplant
with 3-5 sec burn duration and 265 to 455 kN of thrust.
The PRD-18 design used 14 tubes of NMF-2 propellant and
a variable cross section throat.
The second stage operates
with two-component hypergolic fuel, consisting of
TG-02 fuel and AK-20K oxidant
OT-155 is the so-called starting-fuel for
the second stage engine, used for the missiles V-750
(1D, 11D and 13D). It was located in the section 5 of the
tanks. OT-155 (Isopropyl nitrate) generate
the pressure gas for the generator. The gas generator promote
the turbopump to inject oxidizer and fuel in the combustor
with high pressure.
For the missiles V-755 and V-759 (20D and 5V23) this
pressure procedure took over a short black pipe between
the solid booster and the second stage. About this gas pipe,
a small portion of the pressure gas from the booster reached
the turbo pump of the engine. After dropping the booster,
the pressure gas took over by the second stage engine to
drive the turbo pump.