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