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