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  1. Sierra Space Expands VORTEX® Product Line with New 1,500 lbf …

  2. Rockets & Propulsion for Commercial Space Flight - Sierra Space

  3. U.S. Government Awards Contract to Sierra Space to Develop …

  4. New Upper Stage Rocket Engine a Step Closer to Reality

  5. VORTEX® UPPER STAGE ENGINE ACHIEVES CRITICAL DESIGN …

  6. Vortex Rocket Engine for Private Dream Chaser Space Plane …

  7. Auburn’s Advanced Propulsion Research Lab and Altair acquire …

  8. Sierra Space Expands VORTEX® Product Line with New ... - Space …

  9. Sierra Space Completes Hot-Fire Test of New Hypergolic Engine

  10. ORBITEC Expands Vortex Rocket Engine Family with Successful ...