False Narrative: "North Tower Antenna Dropped Before Roof Line"

Mendel

Senior Member.
The antenna falls vertically. The NW corner and SW fire do not fall.
alternate version:
Screenshot_20230125-161523_Samsung Internet.jpg
The antenna tilts away from the viewer as the "top block" tilts down at the back of the buildung. The leverages involved mean that the antenna goes down more as the roof line near the viewer does, since the roof line is supported by the "hinge".

The advantage of my version is that the hat truss can remain intact, see my post #21.

Your version requires that the hat truss breaks, which you haven't explained.
 

Abdullah

Active Member
The antenna tilts away from the viewer as the "top block" tilts down at the back of the buildung.
Then the fulcrum must pass northwest of building center, because the CG is moving down. Also, the camera angle means the fulcrum must pass north of the SW corner. So I think we should see a fire drop.

Also, since the fire is above the fulcrum, we should see it tilt away like the antenna.
 
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Mendel

Senior Member.
Then the fulcrum must pass northwest of building center, because the CG is moving down. Also, the camera angle means the fulcrum must pass north of the SW corner. So I think we should see a fire drop.

Also, since the fire is above the fulcrum, we should see it tilt away like the antenna.
but the levers are shorter, so the movement is less visible
 

Abdullah

Active Member
@Mendel was somewhat correct. I very closely observed the Sauret view. It really does seem that the visible antenna movements were tilting.

But there is still the issue of subpixel measurements showing roof concavity.

from the Sauret projection at the whole building above floor 92, flashing between frames 120 and 220 (just over 1.5 sec interval). Remember that the NW corner starts to accelerate downwards around frame 224:


http://www.sharpprintinginc.com/911_misc/sauret_120-220.gif
sauret_120-220.gif



In order to see the degree and direction of local deformation at any point, just hold your pointer still over that point and notice the degree of wiggle.

Notes:

1) The east corner of the building stays pretty still. The whole portion below floor 98 stays pretty still.
2) The NW corner window washer actually wiggles east-west. Almost no downward displacement, but observable eastward displacement.
3) Notice that the whole west corner above floor 98 is being pulled inwards. The pull-in first becomes noticeable just above floor 98 and grows much stronger in the top few floors.
4) From this projection, the antenna is moving downwards and hooking to the east. It is as if it is falling and slightly pivoting. It seems as if its eastward angle increases slightly over this interval.
Content from External Source
https://web.archive.org/web/2020081...op=view_page&PAGE_id=176&MMN_position=586:586
 

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