RD-253
Rocket engine
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The RD-253 and its later variants, the RD-275 and RD-275M, are liquid-propellant rocket engines developed in the Soviet Union by Energomash. The engines are used on the first stage of the Proton launch vehicle and use an oxidizer-rich staged... Wikipedia
Chamber: 1
Cycle: Staged combustion
Diameter: 1.5 m (4 ft 11 in)
Dry weight: RD-253: 1,080 kg (2,380 lb); RD-275: 1,070 kg (2,360 lb); RD-275M: 1,070 kg (2,360 lb)
Gimbal range: 7.5°, single plane
Manufacturer: Proton-PM
Mixture ratio: 2.67