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