RD-8

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RD-8 (РД-8)
Country of origin
Staged Combustion
Configuration
Chamber4
Performance
Thrust, vacuum78.45 kN (17,640 lbf)
Chamber pressure7.747 MPa (1,123.6 psi)
Specific impulse, vacuum342 s (3.35 km/s)
Burn time1100 s
Gimbal range±33°
Dimensions
Length1,500 mm (59 in)
Diameter4,000 mm (160 in)
Dry weight380 kg (840 lb)
Used in
Zenit family second stage
References
References[1][2][3][4][5][6]

The RD-8 (Russian: РД-8 and

Yuzhnoye Design Bureau as the vernier thruster of the Zenit (GRAU: 11K77) second stage.[7] As such, it has always been paired with the RD-120 engine for main propulsion.[8][1]

It can only be started once, and as a high altitude engine it has a thrust of 78.45 kN (17,640 lbf) and a specific impulse of 342 s (3.35 km/s).[5][6] It is the first ever steering engine to use the staged combustion cycle, and as such is the basis for a family of planned engines for the Mayak launch vehicle family.[3]

The engine itself is built like a hollow cylinder, with a cylindrical space in the center so the RD-120 nozzle can pass through.[9]

Derivatives

Whilst

LOX and kerosene propellant for the Mayak launch vehicle family.[3]

Not only had Yuzhnoye mastered the most complex cycle for the propellant (

Yuzhmash in Dnipropetrovsk, and the RD-120 thrust augmentation project of 2001 to 2003 had been a mixed project between the three companies.[3]

On the base of this experience, a family of derivatives engines were proposed. While the RD-801 and RD-810 are really just based on the general technology, the other members of the family are related enough that they reuse many components of the RD-8.[3] One characteristic of this family is the limitation of keeping the preburner output temperature below 500 °C (932 °F).[3]

  • RD-805 (or RD-802): A proposed upper stage engine of just 19.62 kN (4,410 lbf) of thrust, it would use a single chamber of the RD-8.[10] While many new components would be required, it is considered a low technological risk since it only needs smaller versions of already developed component.[3]
  • RD-809 (sometimes identified as RD-809M): It is an RD-8 re arranged to minimize its diameter. It would use practically every single component of the RD-8, but arranged without the big hollow section in the middle. It was a proposed engine for a proposed liquid upper stage of the Antares rocket, then named Taurus II.[3] It would be capable of five engine burns in a single mission.[11]
  • RD-809K: A proposed single nozzle version of the RD-8. It would mix most principal elements of the RD-8 like the turbopumps with a main combustion chamber and nozzle adapted from the
    RD-861K.[3][12] It would be capable of 4 starts in a single mission.[12] It is expected to be used in a dual engine configuration in the Mayak upper stage.[3]

See also

  • RD-120 – The Zenit second stage main engine which is the companion of the RD-8 and the basis for some of its derivatives.
  • Zenit – The launch vehicle family for which the RD-8 was developed.
  • Mayak – Prospective Ukrainian launch vehicle family for which the RD-805, RD-809 and RD-809K are being developed.
  • Yuzhnoe Design Bureau
    - The RD-8 designer bureau.
  • Yuzhmash
    - A multi-product machine-building company that's closely related to Yuzhnoe and manufactures the RD-8.

References

  1. ^ a b Gunter Dirk Krebs (2015-12-15). "Zenit family". Gunter's Space Page. Retrieved 2016-07-14.
  2. ^ a b Brügge, Norbert (2016-07-11). "Ukrainian space-rocket and missile liquid-propellant engines". B14643.de. Retrieved 2016-07-14.[permanent dead link]
  3. ^
    ISSN 1727-7337. Archived from the original
    (PDF) on 2016-08-16. Retrieved 2016-07-14.
  4. ^ "RD-8". Defense Industry Of Ukraine Products And Services. Archived from the original on 2016-08-18. Retrieved 2016-07-14.
  5. ^ a b c "RD-8". Yuzhnoye. Archived from the original on 2016-07-09. Retrieved 2016-07-14.
  6. ^ a b c "Liquid rocket engine RD-8". Yuzhmash. Retrieved 2016-07-14.
  7. ^ a b "Двигатели 1944-2000: Аавиационные, Ракетные, Морские, Промышленные" [Aviadvigatel 19442-2000: Aviation, rocketry, naval and industry] (PDF) (in Russian). pp. 265–266. Retrieved 2015-07-25.
  8. ^
    ISBN 978-0-387-69848-9
    .
  9. ^ Zak, Anatoly (2013-01-31). "Stage II of the Zenit rocket". Russian Space Web. Retrieved 2016-07-14.
  10. ^ "RD-802". Defense Industry Of Ukraine Products And Services. Retrieved 2016-07-14.
  11. ^ "RD-809". Yuzhnoye. Retrieved 2016-07-14.
  12. ^ a b "RD-809K". Yuzhnoye. Retrieved 2016-07-14.

External links

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