An air vehicle propulsion system incorporates an engine core with {TAIL ~ a power shaft} to drive {HEAD ~ an outer blade row} 
An air vehicle propulsion system incorporates an engine core with { TAIL ~ a power shaft } to drive { HEAD ~ an outer blade row }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD