Great reference Falcon, thanks...
As to the reference to weights added to the King Air wings, I do not know the details of the modification, my experience testing King Airs and Navajos with wing tip survey booms has me thinking that added weights might have more to do with altering the natural frequency of the wings, rather than a C of G change in the wing as a unit.
I would expect that this is similar to Bell Helicopter's "Noda-matic" suspension system, though I cannot find a photo of that. It works with small weights, with some freedom of motion in a vertical plane acting sort of as servo masses to the rest of the suspension system of the helicopter. It took out vibration. Eurocopter has something similar under the front cabin floor of AS350's.
Weights, with some degree of freedom, are apparently used in the roofs of tall buildings, to take out resonances triggered by wind.
