the spring ends being attached such that at low pitch {HEAD ~ the spring} applies a moment tending to decrease blade pitch, at moderate pitch the spring exerts no significant moment, and at high pitch the spring applies a moment tending to increase {TAIL ~ blade pitch} 
the spring ends being attached such that at low pitch { HEAD ~ the spring } applies a moment tending to decrease blade pitch , at moderate pitch the spring exerts no significant moment , and at high pitch the spring applies a moment tending to increase { TAIL ~ blade pitch }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL