Of the 3 possible locations for where the NE corner assembly came from, the blue shape doesn't match the upper break in the columns at the very corner.
We also know from video that everything above floor 97 started to move downwards at the earliest moments of the collapse. The failure line would have gone right throught the middle of the blue shape, yet the falling object doesn't seem to be deformed at all through it's mid-section.
Only the red and the dark green positions match the length of column sections around the corner and wouldn't be ripped in half by the initial failure.
We notice that the entire bottom of the sheet seems severed along a straight line at the botton of a spandrel plate.
We know that the bottom of the red shape is floor 92, too low to have been seriously affected by prolonged exposure to fire and heat.
Therefore the assembly must have been where the dark green shape is marked.
This is the NE corner about 20 minutes before collapse.
The lower edge of the NE corner assembly was severed across the columns along a horizontal line just below a spandrel plate.
The lowest fire is on floor 92.
The green outline had it's lower edge along floor 98. The lower edge of the red outline is along floor 92.
This shows why the green outline is the better choice to locate the NE corner assembly.
Created on 03/07/2009 05:47 AM by admin
Updated on 04/29/2011 08:26 PM by admin