Showing posts with label WTC collapses. Show all posts
Showing posts with label WTC collapses. Show all posts

Wednesday, June 23, 2010

Distorted Tilt Confirmed

To explain the constant acceleration of the upper block of WTC 1, Ryan Mackey insists that the initial tilt of the Tower misaligned the columns to a point where the impacts were not square enough to produce sufficient deceleration. He demonstrated this in a Hardfire debate with Tony Szamboti, using this graphic.

However, Scootle Royale demonstrated that Mackey was incorrect in his analysis, pointing out that the upper block did not rotate about a fixed point as Mackey's slide states. Here, I will expand on Scootle's rebutal to Mackey by using another debunker's analysis. Shortly after the Hardfire debate aired, debunker AlienEntity posted the following video in support of Mackey's theory.



The video basically confirms that the tilt was instant in the collapse. But after I watched it a few times, I realized that it may also confirm exactly what Scootle pointed out. To test this, I first took Mackey's original graphic and straightened it out to illustrate the Tower prior to tilting. Then, I set it next to Mackey's graphic of the tilted Tower with markers added.

I've numbered the floors for both graphics so that debunkers will not accuse me of incorrectly adjusting Mackey's original graphic.

What this comparison shows is that, if the upper block truly "rotated before falling" as Mackey's slide states, then the north side of the Tower would have remained fixed relative to the original height of the building. Here, I've taken AlienEntity's original video and added my own marker to the roofline of the building. And it clearly shows that the north side does not remain fixed. It falls at the same time the tilt begins.



Mackey's analysis is clearly incorrect, and does not adequately explain the lack of a jolt in the North Tower's collapse. Until proven otherwise, the acceleration of WTC 1 clearly violates the laws of physics.

Side note: I would like to take this opportunity to thank AlienEntity, as his work has been very useful to me recently.

Thursday, February 4, 2010

Debunker Verinage Fantasies are Bunk!

I was gonna make a video out of this but I couldn't be bothered. Also my camera battery charger is busted and I can't do any narration until I get another one.

There's been a number of posts the last few months on the JREF forum about a european method of demolition known as "Verinage". Basically this method involves weakening a few floors and displacing the weakened floors to cause the entire top section to slam into the lower section. The thermite deniers claim videos of this method of demolition prove that the upper floors of the north tower could have destroyed the rest of the building at a rate comparible to freefall, since the time it takes for these buildings to fall is comparible to a freefall time.

However, as I touched on briefly in my Fires, Explosions, Demolitions, Collapses, Crushdowns and the World Trade Center video, the Verinage demolitions actually seem to support our claims because in all three of the videos I could find, the rate of fall appeared to slow down after the upper section impacted the lower section.

I never actually measured the rate of fall of these buildings though. Well I have now. One evening when I was making my pop culture video, I had a bit of a mad moment and decided to use Adobe After Effects to depict the Queen stealing Miley Cyrus' soul! My crude 70s Sci-Fi FX aside, in order to make that I had to learn how to use motion tracking.

When I found out that After Effects even makes a speed-time graph of the motion, I decided to motion track some points on these Verinage videos to see how the speed changed over time.

ABC Tower, Balzac, Vitry-sur-Seine
February 14, 2007



Three points were tracked and the three tracks were averaged. The graph below is the speed-time graph of the average.



Glacis, Belfort
February 21, 2008



Five points were tracked and the five tracks were averaged. The footage was stabilized first. The graph below is the speed-time graph of the average.



Broca Tower, Argenteuil
August 22, 2007




Five points were tracked and the five tracks were averaged. The footage was stabilized first. The graph below is the speed-time graph of the average.



Now I don't claim this to be in any way scientific. All three videos are at an angle and the graphs are speed-time graphs, not velocity-time graphs, so obviously there's gonna be some accuracy issues, but still I think this gives you a fairly good idea of what a section of building falling on another section of building should look like. Notice how in all three cases there's an initial acceleration and then upon impact the acceleration abruptly ceases and a deceleration trend begins. This is exactly what we would expect using basic physics and common sense. The tracks go a bit wild towards the end because of the dust clouds getting in the way, that's why I did several and averaged. Now let's look at the north tower ...



Three points were tracked. This was a bit more difficult because of the smoke. The graph below is of all three tracks together.



I think that's pretty clear! Just like Chandlers' analysis and MacQueen & Szamboti's analysis, my tracks have produced a reasonably straight line. For at least two seconds the north tower accelerated constantly, further proof of the lack of jolt.

The three Verinage demolitions are perhaps the closest real-world examples we have for comparison to the North Tower, and they clearly behave differently. The fact remains that what happened to the north tower was unprecedented, regardless of how much you wanna exaggerate the tilt!

See Also:

Einsteen, Szamboti and Greening's analysis of the Balzac-Vitry demolition
(From here)

What a Gravity-Driven Demolition Looks Like
by David Chandler

Lack of Deceleration of North Tower’s Upper Section Proves Use of Explosives
by Tony Szamboti