The swirling stream of air circulates about {TAIL ~ the common axis} of {HEAD ~ the nozzles} 20, 30 and centering surfaces 25, 34 
The swirling stream of air circulates about { TAIL ~ the common axis } of { HEAD ~ the nozzles } 20 , 30 and centering surfaces 25 , 34
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH