{TAIL ~ An elongate drive shaft} extends from an engine mounted fore of {HEAD ~ the concavity} to the impeller 
{ TAIL ~ An elongate drive shaft } extends from an engine mounted fore of { HEAD ~ the concavity } to the impeller
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH