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The walls are reinforced, in addition to the columns. The walls are not CIP. CIP would not have had the ability to hold off the impact of the wings or the tail (looking at the picture of the oroginal impact, you can easily tell the tail and wings made basically no damage to the walls, which is impossible). I really can't tell how thick the concrete is from the pictures, and I've been looking for months. I have a pretty good source for my information, and I suppose you do too. I'd like to take a more direct approach - simply request the information from the city of D.C. or call and find out the company that constructed it and ask for the blueprints - but something tells me that'd put me on a terroist list or two. So, in this case, I guess we'll have to agree to dissagree.
BTW, had the plane been moving at 530 miles per hour, it would have to have been traveling at between an angle of 47 degrees even 90 degree - but for the sake of the crashsite, I'd say somewhere between 47 and 67, otherwise it ould have hit the roof, not the wall. Any lower, and the drag would have slowed it substantially. Therefore, either the plane hit at an angle that would have put the plane down into the ground ( this contradicts the only video evidence of the Pentagon crash), or the plane was traveling much slower (contradicting the investigation), or the projectile was something that gets less resistence. I studied at Embry Riddle (Aeronautics School, Daytona) for about 3 years in case you're wondering.
I'm wondering why the wings and tail didn't even leave a noticable mark. Whether the walls are CIP or reinforced, I'd expect the reinforced walls to be at least 'nicked' by the impact of wings on a plane traveling at even, lets say, 350 miles per hour.
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