It is possible to see how the entire west perimeter of WTC1 peeled away from the building as a single continuous sheet from floor 94 downwards using publicly available video.
In this series of images I use the video available on Youtube
here
The Youtube page has a link to download the video.
I use the free software Virtualdub 1.8.8 available
here. This allows me to view downloaded video frame by frame, forward and backward, and copy frames. This is far superior to viewing the video itself via Youtube.
frame 0
frame 132
We compare frame 24 on the left. The lowest line of fire on the left is floor 92.
frame 132 (f132) is the first time during the collapse in which we can see the movement of the top of the peeling sheet.
In the next series of photos the orange arrow points to the top edge of the peeling sheet. The red line is the position the sheet must be in to be consistent with the visible movement.
In the photo above the blue line shows the floor 97 height in both photos. The lowest line of fire on the left is floor 92.
The yellow line traces the first visible motions of the top of the sheet.
The green arrow points to a visibly intact NW corner.
Using this and the next few images we can verify that the top edge of the sheet is from around floor 94 (it is too high to be floor 92).
frame 141
The movement of the top edge of the sheet is visible (orange arrow).
The red shape is the projected location of the peeling W perimeter.
The blue circle below shows the smoke ridge formed by the top of the peeling sheet
frame 152
The top edge continues to visibly move outwards fro the next hundred frames.
frame 252
frame 286
The orange arrow once again points to the top edge of the peeling sheet. The objects circled in blue are not interconnected with the sheet at this moment.
frame 314
This is one of the last frames in this short but educational video.
We have watched the entire perimeter peel as a single sheet from floor 94 until the sheet fell for about 50 stories (frame 314 shows the top perimeter even with the top of WTC7, fl 48).
The purpose of this demonstration is to show it is very possible to know how the west perimeter of WTC1 fell by using visible reference points on available video. It fell as a single unbroken sheet from floor 94 downwards for at least 50 floors, maimtaining a continuous structural integrity and peeling outwards.
Created on 04/12/2009 06:26 PM by admin
Updated on 04/12/2009 09:04 PM by admin
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