davidschandler's blog

Acceleration + Serendipity

This is a study of the overall downward acceleration of WTC1, the North Tower of the World Trade Center. During this investigation it was discovered that the one feature that kept pace with the original acceleration of the roofline was the leading wave of ejections on the west wall.

Cutter Charges in the North Tower of the World Trade Center

[This is an updated version of the video to correct some errors in the characterization of the corner columns and to generally improve the information content. Rather than simply delete the old YouTube video I've added a link to go from it to the new one. This should cover those who have already embedded or linked to the old version. Sorry for the hassle, and thank you members of the AE911Truth team who caught the error. -- DSC]

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South Tower: Exploding Projectile

A close-up view of debris being ejected from the South Tower of the World Trade Center as the 30-floor top section falls to the east shows numerous smoking projectiles that look like comets. Several of them can be seen to explode. One such exploding projectile is followed here. It ejects two fragments, both of which undergo secondary explosions. (Note, the rising fragment to the left of the projectile under consideration appears to be a tumbling object that alternates from black to white to invisible. It passes behind one of the fragments described in the video.)

--David Chandler

South Tower Smoking Guns (Follow-up)

Near the end of the video I posted yesterday I pointed out a projectile that changed directions midair while trailing white smoke. After finding that projectile, I looked for it in other videos of the WTC2 collapse. I found a video from a similar point of view to the first (and Nate found me a high-res version of it), except in this video the trail can be followed all the way to the bottom of the collapse. This follow-up video explores the significance of this find.

South Tower Smoking Guns -- A new AE911Truth YouTube video by David Chandler

This view of the destruction of the South Tower of the World Trade Center displays a remarkable number of features that support the interpretation that it was destroyed by explosives. I want to acknowledge the tremendous service provided by Nate Flach who serves as the defacto "video archivist" for AE911Truth. He is the one who first called this video to my attention, because of the huge number of simultaneous squibs on the west side of the building above the impact point.

Downward Acceleration of the North Tower

http://www.youtube.com/watch?v=xG2y50Wyys4

The roofline of WTC1 (The North Tower) begins dropping with sudden onset and accelerates uniformly downward at about 64% of the acceleration of gravity (g) until it disappears into the dust. This means it is meeting resistance equal to about 36% of its weight. The implication of this, however, is that the force it is exerting on the lower section of the building is also only 36% of the weight of the falling section. This is much less than the force it would exert if it were at rest. The acceleration data thus prove that the falling top section of the building cannot be responsible for the destruction of the lower section of the building.

WTC7: NIST Finally Admits Freefall (Part III)

WTC7: NIST Finally Admits Freefall (Part III) is now posted on YouTube. This concluding segment explores the implications of NIST's concession (to easily observed reality) that freefall occurred.

WTC7: NIST Finally Admits Freefall (Part II)

This is not the "Part II" I had originally envisioned. That will have to wait for Part III. In following up on the erroneous measurement described by John Gross in Part I, I decided to look more carefully at the measurement and find the video frame NIST claims marks the beginning of the collapse. What I found is that there is no motion of the roofline for at least 20-30 video frames after the point identified by John Gross. In other words, the measurement is a complete fabrication with the goal of producing a "measurement" to agree with the result predicted by NIST's collapse model. This result is sufficiently significant to merit its own video.
--David Chandler, AE911Truth

"WTC7: NIST Admits Freefall" ...The Movie

http://www.youtube.com/watch?v=V0GHVEKrhng

NIST has now officially accepted that WTC7 came down with the acceleration of gravity, but they still couch it as a phase in a 5.4 second interval they claim matches the 5.4 seconds required for their model to collapse 18 floors. The starting point of their 5.4 second interval is totally arbitrary. This new video highlights the August 26 technical briefing and allows Sunder and Gross to shoot holes in their own feet. Part II, which is planned to come out in a week or two, will go into detail about the implications of freefall. A list of bullet points has been compiled on that topic already, but if anyone has a special take on it that they would like to feed into the mix, please contact me at dchandler@ae911tuth.org.

WTC7 in Freefall

This relates to a video I posted on the YouTube AE911truth channel ( http://www.youtube.com/watch?v=gC44L0-2zL8 ) and a related question I posed to Shyam Sunder in the August 26 Tech Briefing (with his answer):

Regarding the video:
Contrary to the August 2008 NIST report on WTC7, the acceleration of Building 7 has been measured and is found to be indistinguishable from the acceleration of gravity over a period of about 2.5 seconds during the fall. Freefall indicates zero resistance. It also indicates that the energy of the falling mass is not available to do work on the lower structure (i.e. such things as breaking, bending, crushing, etc.) A video detailing the measurement process and commenting on the results is posted on the AE911Truth YouTube channel, accessible through http://www.ae911truth.org/freefall. The video responds to the recently released NIST WTC7 document.