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