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