Description
Cyclone-4 LV first stage sustainer engine provides second stage starting up to the first space speed in the upper air layers.
The RD-261 consists of 3 double-chambers blocks which are assembled on a single frame fixing to a completed unit. Each block has its own turbo pump set and produced on the scheme without afterburning of turbine operating body. Combustion products of main propellant components are used as a turbine operating body.
