The rotor assembly 7, wherein {HEAD ~ the collective control linkage} for {TAIL ~ each} of the blades comprises: 
for
The rotor assembly 7 , wherein { HEAD ~ the collective control linkage } for { TAIL ~ each } of the blades comprises :
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH