I've been thinking. Would it be any more efficient to use the angular momentum of a spinning rocket engine nozzle to eject the rocket fuel? Just an idea. Post any questions below
I'm afraid that it won't work, but I like the way that you think. Imparting spin to the exhaust flow would just subtract from the efficiency of the engine. The only reason that I can think of to do so would be to cause a counter-rotation in the vehicle and thus provide pseudo-gravity.