Encyclopedia Astronautica

Credit: KBKhA
Kosberg lox/lh2 rocket engine. 98.1 kN. Centaur upper stage (Atlas); high performance upper stages for Onega, Proton, Angara launch vehicles. Design concept 1998-. Isp=463s.

Proposed Russian version of RL10A-4-1 by Pratt & Whitney. Main modification are new turbopumps. May be derivative of RD-0128 project. Pratt & Whitney signed a preliminary marketing agreement on 7 April 2000 with Russia's Chemical Automatics Design Bureau giving Pratt & Whitney exclusive international marketing rights to the RD-0146 which CADB had been developing for the new Angara rocket family. The RD-0146 thrust level fell between those of Pratt & Whitney's workhorse RL-10 and the cancelled Euro-American SPW-2000. As of 2007 the engine was being marketed for use in future high performance upper stages for the Onega (improved Soyuz), Proton, or Angara launch vehicles. Performance here is from KBKhA web site, 2007. Original quoted performance was 100 kN thrust / 470 sec specific impulse.

Application: Centaur upper stage (Atlas); high performance upper stages for Onega, Proton, Angara launch vehicles.


Engine: 260 kg (570 lb). Chamber Pressure: 79.00 bar.

Status: Design concept 1998-.
Thrust: 98.10 kN (22,054 lbf).
Specific impulse: 463 s.
First Launch: 1998-.

More... - Chronology...

Associated Countries
See also
Associated Manufacturers and Agencies
  • Kosberg Russian manufacturer of rocket engines. Kosberg Design Bureau, Russia. More...

Associated Propellants
  • Lox/LH2 Liquid oxygen was the earliest, cheapest, safest, and eventually the preferred oxidiser for large space launchers. Its main drawback is that it is moderately cryogenic, and therefore not suitable for military uses where storage of the fuelled missile and quick launch are required. Liquid hydrogen was identified by all the leading rocket visionaries as the theoretically ideal rocket fuel. It had big drawbacks, however - it was highly cryogenic, and it had a very low density, making for large tanks. The United States mastered hydrogen technology for the highly classified Lockheed CL-400 Suntan reconnaissance aircraft in the mid-1950's. The technology was transferred to the Centaur rocket stage program, and by the mid-1960's the United States was flying the Centaur and Saturn upper stages using the fuel. It was adopted for the core of the space shuttle, and Centaur stages still fly today. More...

  • Novosti kosmonavtiki, Issues. 21-22, 1998 via Dietrich Haeseler.
  • KBKhA Web Site, Web Address when accessed: here.

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