rocket propulsion and "vortexes" Hi I have been reading a little about vortexes of late. ie hurricane shaped formations. and I wondered if such vortexes were deliberately designed into rocket propulsion systems. I have seen no examples of such in standard rockets whether they be powered by a fuel/oxygen mix or black powder, but of course my research is relatively limited and most diagrams do not go into great detail for simplicity. I was wondering if by forcing the expelled gases of a rocket engine whether it be a space shuttle, ICBM or fireworks into a vortex would create better lift. Of course for something like the space shuttle you would require counter opposing spins on its engines to prevent a very dizzy ride for its occupants. If this is not a current practice of rocket design would it help? My thoughts are this, As the gases exit the engine it is rapidly moving away from the craft and as such propels the craft forward. ie equal and opposing reactions. But at the same time the gases are expanding in other directions, surely then through the same equal and opposite reaction rule a lot of energy must be lost in vectors which are not used to propel the object forward (although they may have a stabilising effect). By creating a vortex couldn't the resultant force be better controlled? Does this seem reasonable ?