{HEAD ~ Its external surface}, together with that of the innermost nozzle, creates {TAIL ~ an aerodynamically designed entity} to help enforce the swirling action and the outward speed by using the Coanda effect 
creates
{ HEAD ~ Its external surface } , together with that of the innermost nozzle , creates { TAIL ~ an aerodynamically designed entity } to help enforce the swirling action and the outward speed by using the Coanda effect
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH