vansig wrote:
thrust will be very low, since amount of material expended per pinch is very low, but FF becomes a viable form of propulsion even before it reaches break-even.
This last is doubtful, since power is always at a premium aboard a spacecraft, and if the engine is an energy hog, the spacecraft will have inherent difficulties. Theoretically possible, but sooo much easier if you’re beyond breakeven, and hopefully well beyond.