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