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The RD809K engine generates thrust and controls flight of the upper stages of the Mayak family rockets.

The engine is based on the Cyclone-4 rocket third-stage RD861K sustainer chamber and the Zenit rocket second-stage RD-8 steering engine assemblies. The staged-combustion RD809K is a single-chamber, single-mode engine with a turbo-pump-feed system

The engine gimbaling in two planes provides stage flight control. The engine is capable of multiple (up to 4) burns in flight.

The turbopump assembly turbine uses oxygen-rich gas as a working fluid. A starting fuel is used to ignite propellants in the chamber and the gas generator. The engine is currently in development.

Basic Specifications

Engine mass, kg

330*

Propellants:

Oxidizer

Fuel                                                  

 

Liquid oxygen

Kerosene

Vacuum thrust, kgf

10000

Vacuum specific impulse, kgf·s/kg

352

Propellant mixture ratio

2,62

Engine gimbal angle, ang.deg

±5

Total running time in flight, s

Up to 600

*Engine mass depends on number of ignitions in flight.

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