The rotor blade of this invention has a tip to tip flex beam spar and {HEAD ~ torsionally stiff hollow blades} bonded to {TAIL ~ the spar} throughout the tip most portion of the blades 
bonded to
The rotor blade of this invention has a tip to tip flex beam spar and { HEAD ~ torsionally stiff hollow blades } bonded to { TAIL ~ the spar } throughout the tip most portion of the blades
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH