Safetypee
The rotating vortices around the aircraft moved the rudder. The rapid reversal of rudder movements was another indication of a free floating rudder. No pilot would kick the rudder back and forth in this manner, even if it were physically possible to do so.
Your comment,
"A vortex may have been local to the fin and rudder in combination."
Yes, you are right, the 27' tall vertical stabilizer is now an additional flight control surface, inoperable by the pilot!
The rotating vortices striking this large surface area, BROADSIDE, turns the aircraft into a very effective Weather Vane!
Last edited by wsherif1; 4th Apr 2004 at 20:53.