The power shaft extends through and is supported by {TAIL ~ a counter rotation transmission unit} which drives an inner blade row in {HEAD ~ counter rotational motion} to the outer blade row 
The power shaft extends through and is supported by { TAIL ~ a counter rotation transmission unit } which drives an inner blade row in { HEAD ~ counter rotational motion } to the outer blade row
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH