RD-857

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RD-857

RD-857
Credit: via Dietrich Haeseler

Yuzhnoye N2O4/UDMH rocket engine. RT-20P missile stage 2. Out of production. Designed for second stage of mixed propulsion missile, only flight tests. Thrust vector control by secondary gas injection into nozzle. First flight 1967.

AKA: 15D12. Status: Out of production. Date: 1963-67. Number: 12 . Thrust: 137.30 kN (30,866 lbf). Unfuelled mass: 190 kg (410 lb). Specific impulse: 330 s. Burn time: 215 s. Height: 2.10 m (6.80 ft). Diameter: 0.93 m (3.04 ft).

Second thrust level at 12.75 kN.

Engine: 190 kg (410 lb). Chamber Pressure: 127.50 bar. Thrust to Weight Ratio: 73.68. Oxidizer to Fuel Ratio: 2.6.

Family: Storable liquid. Country: Ukraine. Launch Vehicles: RT-20P. Propellants: N2O4/UDMH. Stages: 8K94 stage. Agency: Yuzhnoye. Bibliography: 323, 344, 348.

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