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