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