What the truth is about 9/11 and the demolition of the twin towers remains to be discovered. Certainly the official explanation does not hold water. You only have to read Richard Gage on the crush-down crush-up theory of Bazant to know what bunkum it is.“Evidently this crush down model and theory is complete nonsense, but it is the official explanation(s) of the WTC 1 destruction on 9/11! A small, fairly weak part C, 95% air, cannot possibly crush a big part A of similar structure only due to gravity and compress it into a 87.3 meters tall tower of rubble on the ground after 10 seconds! Anyone that has just dropped anything on something knows this. Try then to crush this something! You need a big force for that, which gravity alone cannot provide.”
Scaling the twin towers down and relying on layman’s terms the ‘big force’ needed would be something like the power-driving necessary to crush an aluminium beer-can. It would in fact need more since structural steel is stronger than aluminium. But because Newton applied his third law – for every action there is an equal and opposite reaction – across the range of materials, beer-cans make for a reasonable analogy. They are not perfectly analogous, for example, in a beer-can there is no inner core, there are no floors, doors or windows, but we can learn something from this very simple experiment.
To model the twin towers using beer-cans it is necessary to know the thickness of the aluminium. As I cut up beer-cans to make packing shim for my centre lathe I can tell you the thickness is 0.1mm (0.004″). The following are rough workings but good enough to demonstrate the scaling principle.
Circumference of beer-can = 8.15 inches = 0.68 ft
Perimeter of twin tower = 787.2 feet
Scaling is 1158 : 1
Thickness of beer can = 0.1mm = 4 thou.
Therefore for scaling up the beer-can walls to what they would measure at twin tower dimensions.
1158 x 0.004 = 4.632 inches
The thickness of the box columns in the twin towers were at their weakest 1/4 inch by 14 inch square. They also had spandrels welded across them of about 1/4 inch. These box pillars were spaced some 3 feet apart and welded together in strips of three across spandrels which I estimate themselves are five feet deep, ten feet wide and 1/4 inch thick. The inner core was even more rigid.
Scale models are used to test the viability of something being built. Engineers know that scaling up, and down works, as it should. That’s why they do it.
The structure of beer-cans is much less sturdy than the twin towers. When I did the above rough calculation to scale beer-cans to twin tower dimensions it surprised me to learn that it would take less than two and a half beer-cans to reach above twin towers proportions (about the same as you see in the photo). They look fatter but that is because they are cylindrical.
Anybody who still believes the nonsense that the top of the twin towers could cause a crush-down effect should stamp on a beer-can. Yes, it can be crushed down. But the amount of kinetic energy needed is huge. Also it does not always crush down evenly. It could not be done for example by dropping an empty, or even a full beer-can (believe me don’t waste the beer) so why anybody thinks it could happen to the twin towers is beyond me. Yet that is what those asking you to believe the crush down theory or the progressive collapse theory want you to believe.
Thankfully I never bought into that bunkum. But then I am a toolmaker. As Jonathan Cole quoting Feynman emphasised: “It doesn’t matter how beautiful your theory is, it does not matter how smart you are, if it does not agree with experiment, it’s wrong.”