Wheel In the Sky
Ningen, a budding no-planer, thinks he's got proof that one of Flight 11's wheels and the columns from WTC 1 could not have ended up where they supposedly ended up, which is on Cedar Street, approximately 500 feet from the tower.
He (I assume) goes into great detail but essentially the argument boils down to "I don't believe it." So I thought I'd do a little rough calculation.
We'll assume that the wheel hit on the lowest level impacted by Flight 11, which according to Wikipedia is floor 93, which we'll estimate at approximately 1,189 feet above the ground. Therefore, we know that the freefall time to the ground would be about 8.6 seconds. How fast would the wheel and the steel columns have to be going to end up 500 feet away?
Well, about 58 (500/8.6) feet per second, which works out to 40 miles per hour. This seems to be a pretty trivial calculation. Yeah, maybe with air resistance it might have to be a little faster, but nothing that seems impossible on its face.
In an update Ningen gives credit to Spooked for showing that 40 mph is all that is required. Of course, I did it a day before at JREF.