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