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KTDU-5A
Isayev Nitric acid/Amine rocket engine. Used on Luna E-6 probes. Out of Production. First turbopump engine with surface tension propellant management devices in tanks, allowing re-ignition in zero-G.

AKA: KTDU-5;S5.5;S5.5A. Status: Out of Production. Thrust: 45.50 kN (10,229 lbf). Unfuelled mass: 48 kg (105 lb). Specific impulse: 287 s. Specific impulse sea level: 117 s. Burn time: 43 s. Height: 1.91 m (6.26 ft). Diameter: 1.70 m (5.50 ft).

Three fixed steering thrusters using the turbine exhaust gas for attitude control. Thrusts 45.5 + 0.245 kN. System mass 138.2 kg incl. tanks. Used on Luna E-6, Luna E-6LF, Luna E-6LS, Luna E-6M, Luna E-6S.

Chambers: 1 + 3. Engine: 48 kg (105 lb). Chamber Pressure: 62.80 bar. Area Ratio: 43.4. Propellant Formulation: AK271/TG-02. Thrust to Weight Ratio: 50.4658385093168. Oxidizer to Fuel Ratio: 3.6. Coefficient of Thrust sea level: 0.

Family: Storable liquid. Country: Russia. Spacecraft: Luna E-6, Luna E-6S, Luna E-6LF, Luna E-6M, Luna E-6LS. Propellants: Nitric acid/Amine. Agency: Isayev bureau. Bibliography: 225, 320, 329, 342, 344, 85.
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