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