Such a process is distinguished in that the surface experiencing the air pressure is convex and the normals to {TAIL ~ the surface} converge on the rounded shaping vertex of {HEAD ~ the shaper} 
Such a process is distinguished in that the surface experiencing the air pressure is convex and the normals to { TAIL ~ the surface } converge on the rounded shaping vertex of { HEAD ~ the shaper }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD