Noise reduction in counter rotating fan propulsion is accomplished by providing an engine core, driving an outer blade row from the engine core and driving {HEAD ~ an inner blade row} from {TAIL ~ the engine core} 
Noise reduction in counter rotating fan propulsion is accomplished by providing an engine core , driving an outer blade row from the engine core and driving { HEAD ~ an inner blade row } from { TAIL ~ the engine core }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL