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