11. The rail tunnels required electric propulsion , limiting their use for freight. 12. Like most modern icebreakers, " Kronprins Haakon " has a diesel-electric propulsion system. 13. A typical integrated electric propulsion arrangement includes both diesel generators and gas turbines. 14. The benefit of electric propulsion is reduced vibration and environmental impact. 15. "Viktor Chernomyrdin " will have a fully integrated diesel-electric propulsion system. 16. Three Caterpillar diesel engines power two electric propulsion motors giving her a speed of. 17. Jahn has received the Stuhlinger Medal for " Outstanding Achievement in Electric Propulsion ". 18. For satellites, Moog develops chemical and electric propulsion systems and space flight motion controls. 19. This kind of system is called a hybrid-pneumatic electric propulsion . 20. In 1925, the Navy considered conversion to four turbo-electric propulsion .
