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Creative Speculation

In reply to the discussion: WTC 7 Freefall [View all]

OnTheOtherHand

(7,621 posts)
5. quoting from the Final Report:
Wed Dec 28, 2011, 10:54 AM
Dec 2011
In Stage 2, the north face descended at gravitational acceleration, as the buckled columns provided negligible support to the upper portion of the north face. This free fall drop continued for approximately 8 stories or 32.0 m (105 ft), the distance traveled between times t = 1.75 s and t = 4.0 s....

As noted above, the collapse time was approximately 40 percent longer than that of free fall for the first 18 stories of descent. The detailed analysis shows that this increase in time is due primarily to Stage 1. The three stages of collapse progression described above are consistent with the results of the global collapse analyses discussed in Chapter 12 of NIST NCSTAR 1-9.

NCSTAR 1A, p. 45 (PDF p. 87)


So, as Bolo said, Chandler's analysis is consistent with the NIST Final Report explanation. It isn't a matter of "admission."

To be fair to Chandler, he was reacting to an earlier draft of the report, which didn't analyze the three stages. From that, apparently, Chandler decided that NIST was trying to cover up the existence of Stage 2 -- not that NIST had any means to cover up the existence of Stage 2.

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