The blades of {TAIL ~ the second row} are shaped so as to produce a uniform blood flow along {HEAD ~ the trailing edges} of the blades 
The blades of { TAIL ~ the second row } are shaped so as to produce a uniform blood flow along { HEAD ~ the trailing edges } of the blades
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH