A rotor for {TAIL ~ rotary wing aircraft} has a tip to tip flex beam spar and torsionally stiff hollow blades bonded to {HEAD ~ the spar} throughout the tip most portion of the blades 
A rotor for { TAIL ~ rotary wing aircraft } has a tip to tip flex beam spar and torsionally stiff hollow blades bonded to { HEAD ~ the spar } throughout the tip most portion of the blades
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH