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