One of the comments said that this was inefficient. It seems rather ingenious to get electrical power out of a rocket engine while getting thrust. On the other hand, it may violate some laws of physics to suggest that this doesn't have a cost of some kind. It could be the case that the idea is to make a battery last longer while still getting thrust. One of the problems that he may have is that he will need to use batteries for some of this thrust since the airship isn't going to space real fast. It will take more than a day and since some of that will be in the dark, he will have no source of power except batteries.
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