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