RD-120 (Pratt & Whitney and NPO Energomash)

The RD-120 is the second stage engine of the Russian Zenit launch vehicle. Pratt is working with NPO-EM on a modified version for a first-stage small launch vehicle engine, to be designated RD-120M. Changes include a smaller nozzle and gimbals for thrust vectoring. The engine will be manufactured in Russia. (This information is vintage June 1996, things may have changed since then.)

RD-120
Engine statistics
Specification
Applications Zenit 2nd stage
Propellants LOX/kerosene
Thrust in Vacuum 187,400 lb
Isp in vacuum(s) 350
Mixture Ratio 2.6:1
Weight 2480 lb
Chamber Pressure 2361 psia
Expansion Ratio 106:1
Engine Cycle staged combustion
Pump Design Pressures ????






















RL10 : RD-180