送交者: steven 于 2006-4-03, 15:49:39:
回答: steven说的仍然是惯性制导为主 由 deadmeat 于 2006-4-03, 15:37:51:
which has masses. Think of you are carrying a bag of rocks and throwing them to change your speed. You are always under the gravitational field, and your burns cannot be continuous. How many rocks you can carry?
Most of the fuel in the launch vehicle burn to deliever the SV to orbits, there isn't much left there to do burns like it is on Earth. Ion engine doesn't need to carry its own fuel and it can constantly provide acceleration to the SV and make it into very high speed, however, ion engine doesn't provide enough thrust to do things like that. Besides, ion engine is still in its infancy long before it can be use.