Moving the receptor fins controls the extent of interleave thereof with the radiator fins, so as to control {HEAD ~ temperature} of {TAIL ~ the mandrel} 
Moving the receptor fins controls the extent of interleave thereof with the radiator fins , so as to control { HEAD ~ temperature } of { TAIL ~ the mandrel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL