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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

AKA: S5.66. Status: Out of Production. Date: 1970-71. Thrust: 4.09 kN (919 lbf). Unfuelled mass: 305 kg (672 lb). Specific impulse: 280 s. Burn time: 1,000 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.

Family: Storable liquid. Country: Russia. Spacecraft: Salyut 1. Propellants: Nitric acid/UDMH. Agency: Isayev bureau. Bibliography: 321, 344, 7438.
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