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Sierra Space secures Air Force contract for upper-stage engine development
Space Travel and Exploration Tech
Jul 28, 2023
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Space Travel and Exploration Tech

Space Travel and Exploration Tech

Jul 28, 2023

Sierra Space secures Air Force contract for upper-stage engine development

Product updates

  • Sierra Space has secured a USD 22.6 million Air Force contract to advance the development of its VR35K-A engine for future launch vehicles. The contract will facilitate further work on the engine, including refining its flight-weight engine component design.

  • The VR35K-A engine, utilizing liquid-hydrogen and liquid-oxygen propellants, is designed to generate 35,000 lbs force of thrust. Sierra Space claims that the engine offers higher performance and thrust efficiency compared to existing upper-stage engines, enabling a 30% increase in payload mass to orbit.

  • The VR35K-A engine incorporates a fuel-rich staged combustion cycle and a thrust chamber assembly design called “VORTEX” for enhanced specific impulse and increased pressure in a smaller volume.

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