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