31. Combustion of a liquid fuel in an oxidizing atmosphere actually happens in the gas phase. 32. A traditional liquid fuel rocket is probably the cheapest. 33. Brierty said the immediate hazard was a CalNeva liquid fuel pipeline 4 feet below ground. 34. However future versions of Ares I were discussed using liquid fuels as a potential alternative. 35. They can also easily be refueled in the field with liquid fuels such as methanol. 36. The preferred liquid fuel is No . 2 distillate. 37. Catell alluded to expanding into " liquid fuel ." 38. A severe form of engine flooding occurs when excessive liquid fuel enters the combustion chamber. 39. It can produce liquid fuel , which separates from the water physically without need for drying. 40. It was a major success for Goddard, proving that a liquid fuel rocket was possible.