Soul Raven
Member

Registered: Dec 1999
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Posts: 239 |
quote: And also, the Empire State Building once withstood a B-57 crashing into it.
quote: Right. but the Empire State Building is built much differently. Apparently, according to the BBC, the WTC was actually prone to this type of attack do to the way it was constructed.
Well, it was actually a B-25 Mitchell that hit the Empire State Building. A B-25 bomber has a maximum gross weight of about 35,000 and a max cruise of about 275 MPH. A 767 on the other hand has a max gross weight of slightly over 300,000 and a max cruise of just under 600 MPH. Now, given that they were at sea-level and didn't seem to be going quite flat-out, we'll say they hit the WTC tower at 500 MPH. A quick kinetic energy calculation shows that the WTC towers were hit with a force 28 times greater than the Empire State Building (198 trillion foot/pounds, if you must know). You have to realize, though, that the building withstood the impact, and stood for more than an hour before collapsing. The designers, in fact, did their job. A good hurricane would exert far more force on the buildings than that momentary impact. The sad thing is, these planes had practically a full load of fuel. A B-25 only carries 974 gallons on a good day, whereas a 767 has close to 24,000 gallons. The ensuing fire from the jet fuel is what really did the damage to the buildings, by burning the interior of the building and weakening the structure. The weight of the building itself above the crash site did the rest.
The thing that I haven't really heard the news talk about, and the thing that I am most grateful for is: it could have been much worse. The first plane hit around 90 floors up (I believe) and the second hit around the 60th floor. In the hour before the collapse, a lot of people were able to get out that might not have been able to if the planes hit, say, the 20th floor. Also, 757 and 767 can carry between 200-300 passengers, plus crew. I think the most that was on any one planes was 90, and one had as few as 50. 266 people were on those planes, and that is horrible. One person is too many. However, at a different day of the week, on fully loaded flights, it could have been well over 1,000 people instead.
My heart goes out to those who lost loved ones yesterday. I, thankfully, don't know anyone in New York or D.C. and the only impact on my daily life were the stupid price gouging gas stations (which seem to be back to normal today). We can now only help where we can. A group from church got together yesterday to donate blood, and my company is matching employee donations to the Red Cross. Please do what you can to help. Thanks.
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Soul Raven - "Sm� hjerne, stor gl�de"
Wherever you go, there you are.
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