Gentlemen:
The following statement by Dr Hess is in his report on the AA 587 accident. "In addition, the rudder is probably the most powerful aerodynamic surface on the A300-600. It constitutes 30% of the area of the entire vertical stabilizer, itself nearly 490 square feet in area."
When this total, 490 square foot flat plate area, of the vertical stabilizer and rudder combined, was struck broadside by the rotating forces in the left wing tip vortex of the "Heavy B 747, an instantaneous left "Yaw" maneuver was induced, along with the resultant, abrupt, left "Dutch Roll" into the ground. (Low altitude!)
NASA states that the rotating forces in an aircraft wake vortex can reach 300'/sec. AA 587 made a formation join up on the center of a virtual, horizontal tornado!
AA 587 did not encounter two vortices, the first encounter was when they entered the fringe of the left wing tip vortex and the second encounter was when they entered the core of the vortex.
A pilot cannot shear off both engines, from their support structures, by pilot induced rudder inputs alone!
This is the first accident, of this type, in 100 years of flight!
(An aircraft join-up on a virtual horizontal tornado.)
The NTSB will again cover-up the real cause of the accident and blame the pilot for over-use of the rudder!
This accident was not, "Pilot Error"!!!