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originally posted by: waypastvne
originally posted by: sg1642
can you give me a theory on what caused this?
That's easy. This event happened on the 76 floor, east side of WTC 2. The 76 floor is a mechanical floor which contained the HVAC units. A large heat exchanger for the AC units is sitting inside the building at that position it contains a large volume of compressed freon.
The black cloth you see flying out of the window frame is a bird screen used to keep birds from nesting in the AC units. Heat from the fires caused a soldered copper tube connection to fail and the AC unit dumped it's freon out the window blowing out the bird screen.
originally posted by: skyeagle409
a reply to: engineercutout
I don't think that you understand what it takes to bring down a steel frame building. If it is not done right, the building will remained standing and you will have something like this where steel columns of WTC 1 sit within the bomb crater.
Explosives Failed to Bring Down Steel Frame Building 1
Bombed Building in Iraq
Remember, we are not talking about a building built of wood.
Impossible. Even a large clean-up crew cannot cover up evidence of explosives and if a steel frame building is not properly pre-weakened, it cannot be expected to collapse as planned as was the case in 1993 when terrorist tried to topple WTC 1 onto WTC 2.
You seem to be suggesting here, that it would be impossible to rig a large clandestine demolition such as this in such a manner as to leave little or no visible evidence (blasting caps or extra wires or some such) after the fact.
I don't believe it. I think the capabilities of modern explosives technology (circa 2001) would have been capable of such a feat. I'm no expert on the subject, and I've still made no specific claims as to what brought down the towers; but, I do not accept your reasons for why it would have been impossible as valid.
What about the molten metal at the site?
Aluminum at the World Trade Center
Aluminum was present in two significant forms at the World Trade Center on 9-11:
(i) By far the largest source of aluminum at the WTC was the exterior cladding
on WTC 1 & 2. In quantitative terms it may be estimated that 2,000,000 kg of
anodized 0.09 aluminum sheet was used, in the form of 43,600 panels, to
cover the faÄade of each Twin Tower.
(i) The other major source of aluminum at the WTC was the aluminum alloy
airframes of the Boeing 767 aircraft that crashed into the Twin Towers on the
morning of 9-11. It may be estimated that, on impact, these aircraft weighed
about 124,000 kg including fuel; of this weight, 46,000 kg comprised the
fuselage and 21,000 kg made up the mass of the wings – all of which were
fabricated from aluminum alloys.
Report chronicles the final moments of WTC tragedy
The apparent source of this waterfall: molten aluminum from the airliner's wings and fuselage, which had also piled up in that corner. Within minutes, portions of the 80th floor began to give way, as evidenced by horizontal lines of dust blowing out of the side of the building.
Seconds later, near the heavily damaged southeasterly portion of this same floor, close to where the aircraft had entered, exterior columns began to buckle.
What about the explosive evidence claimed in the dust samples?
What about all those architects and engineers that think it was a demo? Your thoughts?
Towers Weakened by Planes; Brought Down by Fire
Analysis by a team of 25 of the nation's leading structural and fire protection engineers suggests that the World Trade Center Towers could have remained standing indefinitely if fire had not overwhelmed the weakened structures, according to a report presented today at a hearing of the House Science Committee. That finding is significant, said W. Gene Corley, Ph.D., team lead for the ASCE/FEMA Building Performance Study Team, because extreme events of this type, resulting in such substantial damage, are generally not considered in building design, and the fact that these structures were able to successfully withstand such damage is noteworthy.
Why the World Trade Center Buildings Collapsed: A Fire Chief ’s Assessment
Thermite most certainly can be used as an explosive. It's all in the device used to house thermite.
Here's an hours worth of what thermite can and can't do. Also pay attention to the rushing sound thermite makes when used as a cutter. Sound familiar ?