KTDU-425

KTDU-425 (11D425)
KTDU-425A at the Cosmos exhibition, GUM, Moscow
Country of originSoviet Union
DesignerAleksei Isaev
ManufacturerIsayev Design Bureau
StatusRetired
Propellent: UDMH/N2O4
Performance
Thrust, vacuum
  • 18.85 kN (KTDU-425)
  • 18.89 kN (KTDU-425A)
    • Used in
    Mars 2-7, Venera 9-16

    Vega 1,2
    Astron, Granat

    Phobos 1,2

    The KTDU-425 was a former Soviet liquid fuelled engine designed Aleksei Isaev of the Isayev Design Bureau. It was mainly used on the 4MV bus, which employed it as its main propulsion system. The first version which was the KTDU-425 (11D425), which had a thrust of 18.85kN was first used in 1971 for Mars-2, Mars-3 as well as the failed M-71C (Kosmos 419) probe.[1] This was soon replaced by the KTDU-425A, which had a thrust of 18.89kN. This version was employed on the remaining 4MV and 5VK probes built, as well as Phobos 1 and 2.[2]

    Variants

    • KTDU-425 (11D425) - First version of the KTDU-425. Employed in 1971 on M-71 Probes. Thrust: 18.85Kn, Specific Impulse: 312s, Burn time: 520s.[1][3]
    • KTDU-425A (11D425A) - Improved version of KTDU-425. Employed between 1973 and 1989. Thrust 18.89Kn, Specific Impulse: 315s, Burn time: 560s.[2][3]

    References

    1. ^ a b "KTDU-425". www.astronautix.com. Archived from the original on December 28, 2016. Retrieved 2022-04-17.
    2. ^ a b "KTDU-425A". www.astronautix.com. Archived from the original on August 19, 2016. Retrieved 2022-04-17.
    3. ^ a b "Spacecraft-propulsion blocks from Isayev Design bureau (Khimmash)". www.b14643.de. Retrieved 2022-04-17.



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