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1. The round objects are the propellant tanks.

2. In a nuclear engine they are simply the propellant gas boiled off stored liquid.

3. The propellant flow rates were controllable either manually or via the on-board computer system.

4. Then a flaring swish as its propellant ignited, accelerating it helter-skelter accumulating redoubtable kinetic energy.Sentence dictionary

5. This propellant combination performs well and permits a fairly compact vehicle design.

6. Thus the propellant remains in the can, can not damage the environment and is unavailable for abuse.

7. The first propellant segment is moulded into an eleven-point star with the points facing inward.

8. To liquefy them for storage in propellant tanks, a considerable amount of electrical energy must be expended to run refrigeration equipment.

9. Ozone has been considered as a candidate rocket propellant for over sixty years.

10. But Columbia lacked at least 450 pounds of propellant in its forward and aft fuel tanks for the task.

11. Early designs used four propellant tanks-two for the fuel and two for the oxidizer.

12. It also allowed the rocket to settle under the stresses produced by the mass of propellant.

13. The thermal energy extracted from the reactor would boil a propellant liquid.

14. Thus, this mission is so demanding that we are forced to use liquid hydrogen as the propellant.

15. The descent engine occupied the centre section,(sentencedict.com) with the propellant tanks arranged symmetrically round the outside to balance the weight distribution.

16. Next come the four segments that contain the solid propellant mixture.

17. In order to achieve a high speed the mass of propellant burnt must be much greater than the mass of the rocket.

18. In that case, we would think first of burning hydrocarbons with liquid oxygen, or even using the hydrogen-oxygen propellant combination.

19. The mission plan called for an upper limit on the amount of propellant that could be used during the descent.

20. The third stage took over after two solid rockets had fired to settle the propellant in its tanks.

21. A particularly simple form of rocket motor uses solid propellant.

22. Rather, it is a power source sufficient for the needs of the propellant factory.

23. The use of polar ice to support such a ballistic-transportation scheme requires a substantial consumption of propellant along the way.

24. An ingenious path to early integration of hydrogen into Martian propellant manufacture has been suggested by Bob Zubrin of Lockheed-Martin.

25. It just happens to be the one that uses the least propellant.

26. However, there is no source of extra oxygen to expend as rocket propellant.

27. Providing life-support materials would take on added importance only after we have found out how to operate the propellant business profitably.

28. An analysis begun Tuesday afternoon and presented to shuttle managers Wednesday concluded that Columbia lacked the maneuvering propellant for a rendezvous.

29. In the types of engine considered below, this is done by using the lightest mass propellant possible-hydrogen.

30. At just ￡5.99 the Blitzer costs less than a can of airbrush propellant!