8:46:30[10]Flight 11 crashes at roughly 466 mph (790 km/h or - TopicsExpress



          

8:46:30[10]Flight 11 crashes at roughly 466 mph (790 km/h or 219m/s or 425 knots) into the north face of the North Tower (1 WTC) of the World Trade Center, between floors 93 and 99. (Many early accounts gave times between 8:45 and 8:50). The aircraft enters the tower intact. It plows to the building core, severing all three gypsum-encased stairwells, dragging combustibles with it. A powerful shock wave travels down to the ground and up again. The combustibles and the remnants of the aircraft are ignited by the burning fuel. As the building lacks a traditional full cage frame and depends almost entirely on the strength of a narrow structural core running up the center, fire at the center of the impact zone is in a position to compromise the integrity of all internal columns. People below the severed stairwells start to evacuate—no one above the impact zone is able to do so.
Posted on: Wed, 11 Sep 2013 12:46:56 +0000

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