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Originally posted by Conundrum04
China was in desperate need of steel so why not, as a good jester
Originally posted by ccaihc
Probably because a plane didn't crash into it weakening the structure, you know. It just kind of fell.
Originally posted by 11Bravo
It was a kind gesture too.
Originally posted by ccaihc
My thread "Resources for the Debunker" should give you some insightful information that should answer all your questions.
Originally posted by Conundrum04
Originally posted by ccaihc
My thread "Resources for the Debunker" should give you some insightful information that should answer all your questions.
I seriously doubt it.
Originally posted by ipsedixit
The tone of the media coverage around the bridge collapse is very serious and business like. They are really going to get to the bottom of it. They are going to inspect other bridges too. Yes sir!
Just compare it to a lot of the tentative, "question marks hanging in the air" style of a lot of the 9/11 reporting. Reporters at that time were walking on eggs, afraid to say the obvious, accepting the most egregious blather from Bush administration spokespersons.
I'd like to take this opportunity to nominate Alex Jones for the Pulitzer Prize. In fact he can take it home and keep it.
There is no saving America. Its a lost cause.
Prepare yourselves is all you can do.
I still talk to people about 911, but my initial optimism that we could expose the blatant cover up of the events surrounding 911 has faded.
Probably because a plane didn't crash into it weakening the structure, you know. It just kind of fell.
My thread "Resources for the Debunker" should give you some insightful information that should answer all your questions.
Originally posted by ccaihc
My thread "Resources for the Debunker" should give you some insightful information that should answer all your questions.
Originally posted by ANOK
Originally posted by ccaihc
My thread "Resources for the Debunker" should give you some insightful information that should answer all your questions.
Your sources have already been proved to be out of date bullcrap.
So you've decide the official story is correct. How did you come to that conclusion? Do you have anything to offer the debate other than links to other peoples out of date web sites?
OK assuming you've done your research, you did research this right, you should be able to easily answer a couple of questions, or three?
What conclusion did you come to about the South Towers tilt and rotation as the collapse begins? What is your explanation for the lack of resistance from undamaged welds and fasteners? One more for now, what is your explanation for the pieces of steel, weighing in the tons, that were laterally ejected up to 600ft away from the tower?
You shouldn't have any problem answering these questions, right?
Originally posted by ccaihc
Thirdly, I'd really like some sources for your claims. I've backed up pretty much everything I've ever said on these forums with some sort of scientific source from somewhere. Having a source for your statements generally will improve my ability to believe what you're saying.
Google Video Link |
In order to allow time for lateral motion, the exterior column(s) that hit WFC 3 were most probably from the upper half of WTC 1. A fall from 1,000 feet to 240 feet would take SQR(2*h/g) = around 6.9 seconds where h = 760 feet and g = 32.17 ft/s^2. In the horizontal plane, a uniform acceleration of 20 m/s^2 for the first second followed by negligible deceleration due to drag for the remaining 5.9 seconds would provide 10 + (5.9 * 20) = 128 metres = 420 feet displacement. At 1,000 feet the WTC 1 perimeter columns, per story, were comprised of:
two flanges of 1/2 x 13.5 x 144 inches each, totalling 1,944 ins^3
one outer web of 1/4 x 13 x 144 inches = 468 ins^3
one inner web of 1/4 x 15.75 x 92 inches = 362 ins^3
one spandrel plate of 3/8 x 40 x 52 inches = 780 ins^3
...totalling 3,554 ins^3 per floor or 10,662 ins^3 = 6.17 ft^3 for a three-floor section which at 490 lb/ft^3 is 3,023 lb (84 pounds per lineal foot) or 1,371 kg. (There is some uncertainty as to the flange thickness; it was known to be only 1/4" at the very highest floors.) The force require to produce an acceleration of 20 m/s^2 in an inertia mass of 1,371 kg is 20 * 1371 = 27,420 N = 6,165 lbf.
The cross-section presented to a wind, per floor, would be 40 x 52 = 2,080 ins^2 for the spandrel plate and 15.75 x 92 = 1,449 ins^2 for the inner web, totalling 3,529 ins^2 per floor or 10,587 ins^2 = 6.83 m^2 for a three-story section of exterior column. (So the required pressure is well under 1 psi.) From the drag equation of
d = Cd * A * r * 0.5 * v^2
we obtain
v = SQR(2 * d / (Cd * A * r))
where r = density of air ~ 1.2 kg/m^3 and assuming a relatively high drag coefficient Cd of 4 / pi ~ 1.27 for a flat plate and d = the previously calculated force of 27,420 N and A = 6.83 m^2 as calculated above. This places the required wind at 72.6 m/s = 162 mph for one second duration. Actual windspeed on the day was up to 10 mph on the ground and up to 20 mph at higher altitude.
Suppose we imagine the collapse initiating at 1,200 feet, and proceeding as per the "pancaking" theory to 1,000 feet. After freely falling 200 feet, the terminal velocity would be SQR(2 * 200 * 32.17 ft/s^2) = 113.4 fps = 77.3 mph. In this theory, there is a small delay due to resistance of the intact building below, but the falling upper section smashes its way through each floor in about 0.1 seconds at the 1,000 feet level. The volume of air per floor is approximately 12 * 200 * 200 feet = 480,000 ft^3. Some will go down, but if the total was forced out through a perimeter of 800 feet by an average height of 6 feet which is an exiting area of 4,800 ft^2, it would (continuing outward) extend for some 100 feet at the end of the 0.1 seconds which is a velocity of 1,000 fps or 682 mph.
Let's set the exiting gases velocity at just 700 fps = 213 m/s, in which case the force acting on the exterior column for 0.1 seconds is given by:
d = Cd * A * r * 0.5 * v^2
= 1.27 * 6.83 * 1.2 * 0.5 * 213^2 ~ 236,000 N
to produce an acceleration of F / m = 236,000 N / 1,371 kg = 172 m/s^2. After 0.1 seconds the velocity of the steel is 17.2 m/s = 38.5 mph, and the horizontal displacement is 0.86 metres. Following another 6.8 seconds at 17.2 m/s the total distance travelled horizontally is 0.86 plus 6.8 * 17.2 ~ 118 metres = 387 feet. The columns have to shear off quickly enough, and the pancaking theory has the problem that the gravitational potential appears to be too low for all the energy sinks, but even this scenario does not appear to rule out the idea that debris could end up a few hundred feet away.
Originally posted by ccaihc
The tilt/rotation is VERY easy to explain. The plane hit building closer to the sides so that side was weaker. When the columns began to fail, they were all failing at the corner. If you take the corner off of something it's going to twist.