According to today's LA Times, these guys really kney what they were doing, with knowledge of the structures, physics, and structural engineering. Had the buildings been hit higher up the towers, they would have sustained damage but probably would not have collapsed because the weight on the damaged portion of the building would not have been enough to overwhelm a tower's structural support.

They had to fly at a height of 60 stories to clear nearby buildings. The first tower was hit about the 80th story. The second tower was hit at about the 60th story, which is probably why it collapsed first (and the fireball caused by the crash was larger and the plane hit the corner of the building, rather than the center, where there is more structural support.) They showed some knowledge of physics in by making the hits as low as possible. The additional explosions people heard were probably ruptured gas lines igniting.

Hank Koffman, head of the Construction Engineering Department at USC: "It was very well thought out. These guys were evil geniuses."

 

I am sorry if this question sounds dumb, but you would think that a very advanced super high pressure sprikler system was installed on a buildig so tall that fire fighters can spray the top of. Maybe the impact disabled the sprinkler system, please let me know what you felt happened.

 

Water doesn't put out burning jet fuel very effectively. Also, water doesn't work when the pipes carrying the water up to the higher floors are melting.

 

Exactly. I was watching CNN today and they had a structural engineer on. He said that the foam is what is needed to put out jet fuel, water does nothing. The jet fuel fire is what caused the steel to lose it's rigidity.

[QUOTE]Originally posted by WestSideBilly
[B]Water doesn't put out burning jet fuel very effectively.