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