11. The operation makes upper-stage rockets and turbopumps for the space shuttle's main engine. 12. :Sounds like a multi-stage rocket , only less efficient and more complex. 13. It is China's first upper stage rocket engine to adopt the staged-combustion cycle. 14. NASA is focusing on multi-stage rockets for the second generation spaceship. 15. The slightly worrysome part is that this was a multi-stage rocket . 16. It does research and is developing a lower-stage rocket with a Russian company. 17. It was the site where the first single-stage rockets with multiple engines were tested. 18. The idea with a one-stage rocket is to save money. 19. The Rehbar-I was a two-stage rocket with all solid-propellant motors. 20. The projectile design therefore included a one-stage rocket which ignites some time after launch.
