The RD801 engine generates thrust and controls flight of the Mayak launch vehicle first stage. The engine is based on technologies tested on the Zenit launch vehicle.

The RD801 is a single-chamber, dual-mode, single-burn engine with a turbo-pump-feed system. The engine uses oxygen-rich staged combustion.

The engine gimbaling in two mutually perpendicular planes provides thrust vector control.

A starting fuel is used to ignite propellants in the chamber and the gas generator.

The turbopump assembly turbine uses producer gas as a working fluid.

A 492-ton-thrust engine cluster, comprised of four RD801 engines can be developed based on the RD801.

The engine is currently in development.

Basic Specifications

Engine mass, kg

1630

Propellants:

Oxidizer                                                                         

Fuel                                                   

 

Liquid oxygen

Kerosene

Thrust, kgf:

Sea-level

Vacuum

 

122224

136566

Vacuum specific impulse, kgf·s/kg:

Sea-level

Vacuum

 

300,7

336

Propellant mixture ratio

2,65

Engine gimbal angle, ang.deg

±6

Running time in flight, s

Up to 200