{TAIL ~ An impeller} is mounted in the trailing end of the concavity and a stator trails {HEAD ~ the impeller} 
{ TAIL ~ An impeller } is mounted in the trailing end of the concavity and a stator trails { HEAD ~ the impeller }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD