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