Does the inertia force change the angular velocity due to increase-decrease in the radius when the blade travels up? Does this cause an excessive bending moment?

  • $\begingroup$ This is what I understand that the question is, please feel free to roll back or edit otherwise if I did not get it right. $\endgroup$
    – Koyovis
    Dec 7, 2017 at 8:34

1 Answer 1


A helicopter rotor usually has flapping hinges, which lifts the blade up when travelling forward and down when travelling backwards. The blade being at an angle indeed causes a change in effective moment of inertia: it would want to speed up when at an incline, and this would indeed cause a bending or warping moment were it not for..

enter image description here

..the Drag Hinge or lead/lag hinge. The image is from this site which contains an explanation on other rotor heads as well.


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