Originally Posted by Mad (Flt) Scientist
The downgoing wing does indeed experience an increase in angle of attack, and in theory, yes, if the Dutch roll oscillation were allowed to progress to a severe enough point then you could induce a local stall (starting at the tip, since the local velocity would be greatest). But it'd have to be a pretty gross Dutch Roll at that point, and I'm not sure you wouldn't see other handling non-linear behaviour (perhaps in yaw) before you reached that point. Even then, the first effect would simply be to reduce the Cl-p contribution a bit, since most of the wing flow would stay attached. To get to the point of actually seeing a "stall" that caused some form of autorotation would require huge roll rates.
Or minimal margin before stall without the Dutch roll. Logically, if the aircraft already is near stall, a small amplitude Dutch roll might bring the falling wingtip past stall?
As for yaw... I suppose the fin might stall, but perhaps not due to Dutch roll...