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