Interpreting the Boeing-767 Deceleration During Impact with the WTC Tower: Center of Mass Versus Tail-end Motion, and Instantaneous Versus Average Velocity (April 11, 2007) Gregory S. Jenkins, PhD
This article is mainly a response to Morgan Reynold's Request for Correction to the National Institute for Technology and Standards under the Information Quality Act (or Data Quality Act), found here:
[Update: I should say that this is a limited response to Morgan Reynolds, because Dr. Reynolds makes a number of points that are not addressed by Jenkins. Jenkins' article is more complete as to me, because I have relied much more heavily on the deceleration issue.]
Jenkins' article also destroys a major premise of several of the articles on this blog, including my first article:
Or maybe it doesn't. I haven't figured that out yet, and it's going to take me some time. The method I used, which was agreed upon by writers on both sides of the debate, was much simpler for someone like me with limited math skills.
So far, I wonder whether Jenkins' comparison with the Sandia experiment is valid, because the plane in that experiment was disintegrated against a reinforced concrete
wall which it did not penetrate at all.
Video of that experiment is here:
True, the tail of the fighter plane doesn't slow, but the plane also is all left outside the wall. This is more like what I would expect to have happened when a Boeing hit the South Tower. I suspect that the answer is that the South Tower is less rigid than the reinforced concrete wall in the Sandia test, which was designed to shield a nuclear reactor from plane impact, but is still quite rigid and would certainly stop the front fuselage of the plane from entering. The big question for me is what would happen when the most massive part of the plane -- the engines and the fuel-laden portion of the wings between the engines -- hit the building. I am thinking of this as partial penetration that would result in a combination of deformation and deceleration, as opposed to the complete fragmentation resulting from a plane dashed to little pieces against a impenetrable concrete wall. I'm thinking there would be a lot more debris outside the WTC tower than observed, and a lot more deceleration than observed, and presumably an explosion.
I also can't understand Jenkin's argument that all the deceleration takes place inside the tower. That's a given if it didn't take place outside, since the plane
did not come through the other side. But I don't see it got inside intact, then disintegrated.
I'm going to try to get further with this by looking at Jenkins' physics and math arguments, but this may be all I can do with it. I've always been grokking this thing the best I can.
Comments on Jenkins' article are most welcome. I begin with my comment on another letter by Eric Salter at Journal of 9/11 Studies on my criticism of him and Steven Jones not citing contrary data. However, I would like comments to focus on the merits of Jenkins' article, which is far more significant. If Jenkins is right, the blatherings of Salter and I mean nothing.