Well, static droop, is just that, static, wouldn't be a factor in flight as to the discussion as far as I can tell. It's useful to know the static droop, as when it's spinning down one can avoid having them hit something, such as a pax.
Coriolis force is what causes the accel/decel of the blades.
With a large arm out to the spanwise CG of the blades, even a small chage an generate a response. I'm not aware of anything else that would cause an overall accell/decel in the context of the discussion (loading and unloading the rotor)
Of course, head design also comes into this, if it is a teetering head, it may be underslung to reduce the actual CG movement in/out at flight rpms.
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Marc
[This message has been edited by RW-1 (edited 11 January 2001).]
[This message has been edited by RW-1 (edited 11 January 2001).]