Analysis of Rocket Projectiles from WTC2

I have uploaded to YouTube ( an analysis of the acceleration of a projectile that races ahead of the surrounding falling debris. I had discussed this object before but due to the difficulty caused by a moving camera I had not previously measured the motion directly.

The object (apparently a perimeter wall unit) raced ahead of its neighboring debris, but its acceleration was about 1/3 of gravity. This is an indication that it was kicked downward initially by an explosion, after which the air resistance partially canceled the effect of gravity as it approached terminal velocity. As it fell, however, there was an outburst of white smoke, at which point the projectile changed directions, slightly, and accelerated downward for about a half second at 1.5 times gravity. It then fell back to continued acceleration a little under 1 g.

The acceleration of the projectile is unambiguous proof that very energetic material was applied to the wall unit. What I found particularly surprising is that the ignition of the material in an unconfined space where it was free to expand three dimensionally would provide sufficient thrust due to expanding gasses alone to cause what was probably a 4-ton wall unit to accelerate 50% faster than gravity. The fact that the unit continued to accelerate close to freefall thereafter is an indication of an ongoing thrust capable of largely canceling the effect of air resistance.

David Chandler Updates: 2 new videos and a video interview

1. I have completed a video showing the analysis of the Balzac-Vitry controlled demolition that used hydrolics rather than explosives to initiate a total demolition. This analysis shows deceleration upon collision, as predicted in the paper, "The Missing Jolt: A Simple Refutation of the NIST-Bazant Collapse Hypothesis," by Graeme MacQueen and Tony Szamboti. It also illustrates the symmetry of destruction, contrary to the "crush down" followed by "crush up" scenario propounded by Zdenek Bazant.

Sue Supriano Interviews David Chandler

On July 19, while I was in Portland to speak at the American Association of Physics Teachers conference I was interviewed by former KPFA programmer Sue Supriano, who now lives in Portland and does radio and podcast interviews for a show called "Stepping Out of Babylon." The interview can be downloaded as an mp3 file and is available here:

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.

Downward Acceleration of the North Tower

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.