the fourth component rotates at a second ratio with {HEAD ~ respect} to {TAIL ~ the rotor} during the second mode of operation; and 
to
the fourth component rotates at a second ratio with { HEAD ~ respect } to { TAIL ~ the rotor } during the second mode of operation ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH