{TAIL ~ A trailing surface} aft of the maximum radius has a radius at {HEAD ~ all points} therealong less than the maximum radius 
{ TAIL ~ A trailing surface } aft of the maximum radius has a radius at { HEAD ~ all points } therealong less than the maximum radius
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH