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KTDU-35
Isayev Nitric acid/UDMH rocket engine. Out of Production. Soyuz, Salyut 4 maneuvering engine. KTDU-53 version in L-1 circumlunar spacecraft; KTDU-66 in Salyut 1 space station. Thrusts 4.09 kN main + 4.03 kN secondary. First flight 1966.
 AKA: 11D62;S5.35 + S5.60.  Status: Out of Production.  Date: 1962-67. Thrust: 4.09 kN (919 lbf). Unfuelled mass: 305 kg (672 lb). Specific impulse: 280 s. Burn time: 500 s. Height: 1.14 m (3.73 ft). Diameter: 2.50 m (8.20 ft). 
Chambers: 1 + 2. Engine: 305 kg (672 lb). Chamber Pressure: 39.20 bar. Propellant Formulation: AK27I/UDMH. Thrust to Weight Ratio: 1.36. Oxidizer to Fuel Ratio: 1.85. Coefficient of Thrust sea level: 0. 
Subtopics
|  | KTDU-53 Isayev Nitric acid/UDMH rocket engine. Zond 4-7 maneuvering engine. Out of Production. Spacecraft maneuvering engine, derivative of KTDU-35 without back-up engine. | 
|  | KTDU-66 Isayev Nitric acid/UDMH rocket engine. Out of Production. Maneuvering engine for Salyut 1, derivative of KTDU-35. Longer burn time of 1000 s. Comprised single-chamber main engine plus dual-chamber back-up engine. Thrusts 4.09 + 4.03 kN | 
Family: 
Storable liquid. 
Country: 
Russia. 
Spacecraft: 
Soyuz A PAO, 
Soyuz 7K-OK Tether, 
Soyuz 7K-OK, 
Soyuz 7K-OK PAO, 
Soyuz Kontakt, 
Soyuz 7KT-OK, 
Soyuz 7K-T, 
Soyuz 7K-T PAO, 
Salyut 4, 
Soyuz 7K-T/A9, 
Soyuz 7K-MF6. 
Propellants: 
Nitric acid/UDMH. 
Agency: 
Isayev bureau. 
Bibliography: 
314, 
321, 
342, 
7437. 
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