High Speed Shaking

[robtek]

Yes, the rudder was jammed to one side, quite impossible when there is someone standing on the rudder-pedals.
The rudder in rl becames pretty stiff at higher speeds (GA -> around 140 - to 160 kts).
There could be powers greater then the leg muscles of the pilot BUT that would have been written down in pilots notes or the manual of the 110 (be aware that if you exceed ......).
There is nothing in the literature!
So for me that is the possybility of a aerodyamic instability wrongfully applied to a stable plane.