Old 6th Dec 2018, 16:10
  #946 (permalink)  
Join Date: Jan 2009
Location: Corpus Christi, Texas
Age: 64
Posts: 33
Low Blade Angle

And that is why blade designers strive to get the overall c.g. of the blade forward of quarter chord or the center of lift, such that if one loses pitch link input on one or all of the blades they will drive themselves to zero (or neutral) pitch. If the c.g. is aft of quarter chord the blade drives itself to maximum blade angle which is a divergent condition and does not help a disastrous situation. If other control failures are present such that the blade is driven to some adverse pitch angle, the c.g. effect may be over-ridden. Otter
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