a compressed spring, the spring having first and second ends, the first end being pivotably attached to the rotor blade, the second end being carried by the spar for {HEAD ~ pivotal movement} relative to the hub and {TAIL ~ the spar} 
a compressed spring , the spring having first and second ends , the first end being pivotably attached to the rotor blade , the second end being carried by the spar for { HEAD ~ pivotal movement } relative to the hub and { TAIL ~ the spar }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL