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