KTDU-80

KTDU-80
Soyuz TM-32 departing the ISS with its SKD nozzle cover closed
Country of originRussia
ManufacturerKB KhIMMASH
PredecessorKTDU-35
StatusIn production
Liquid-fuel engine
PropellantN2O4 / UDMH
CyclePressure fed
Performance
Thrust2.95 kN
Chamber pressure880 kPa
Specific impulse302 s
Burn time890 s
Gimbal range5
Dimensions
Length1.2m
Diameter2.1m
Used in
Soyuz

The KTDU-80 (Russian: Корректирующе-Тормозная Двигательная Установка, КТДУ) is the latest of a family of integrated propulsion system that KB KhIMMASH has implemented for the Soyuz since the Soyuz-T. It integrates main propulsion, RCS and attitude control in a single system pressure fed from a common dual string redundant pressurized propellant system. The common propellant is UDMH and N2O4 and the main propulsion unit is the S5.80 main engine. It generates 2.95 kN (660 lbf) of thrust with a chamber pressure of 880 kPa (128 psi) and a nozzle expansion of 153.8 that enables it to achieve a specific impulse of 302 s (2.96 km/s). It is rated for 30 starts with a total firing time of 890 seconds. The integrated system without the pressurization or tanks weighs 310 kg (680 lb); it is 1.2 m (47 in) long with a diameter of 2.1 m (83 in).[1][2][3]

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