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KTDU-425
Isayev N2O4/UDMH rocket engine. Mars 2 and 3 maneuver engine. Out of Production. Pump-fed engine. Could be throttled to 7.05 kN / 9.5 MPa / 2850 m/s. . Chamber pressure 133,2 - 95 bar.

AKA: 11D425. Status: Out of Production. Date: 1970-73. Thrust: 18.85 kN (4,238 lbf). Specific impulse: 312 s. Burn time: 560 s.

Throttled thrust(vac): 7.050 kN (1,585 lbf). Chamber Pressure: 133.20 bar. Oxidizer to Fuel Ratio: 1.9.

Subtopics
KTDU-425A Isayev N2O4/UDMH rocket engine. Mars 4-7, Venera 9-16, Vega 1-2, and Fobos 1-2 maneuvering engine. Out of Production. Could be throttled to 9.86/9.5/2870. Chamber pressure 149 - 95 bar. First flight 1973.
Family: Storable liquid. Country: Russia. Spacecraft: Mars M-71. Propellants: N2O4/UDMH. Agency: Isayev bureau. Bibliography: 225, 321, 329, 342, 344.
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