{HEAD ~ The concavity} has a trailing end coincident with the transom or trailing edge of the watercraft and has {TAIL ~ a leading end} disposed forwardly of the transom 
has
{ HEAD ~ The concavity } has a trailing end coincident with the transom or trailing edge of the watercraft and has { TAIL ~ a leading end } disposed forwardly of the transom
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH