Wtc 7 fall speed11/19/2023 However, the page needs to be updated and has to refer to the most recent article published by NIST as well. Johninwiki ( talk) 05:00, 25 April 2009 (UTC) Why are they significant to this article? RxS ( talk) 05:25, 25 April 2009 (UTC) The current article already contains an explanation of the previous NIST article. The new findings are significantly different from the previous report, which is why they have to be mentioned. According to Acroterion(see User_talk:Johninwiki) and Cs32en, the new facts belong here to the 7 WTC article, which is what I believe as well, as they are an update to the existing description. RxS ( talk) 02:59, 25 April 2009 (UTC) I hope the new version is acceptable - I boiled the explanation down to the most important facts. Boil it down significantly and it might fit in Collapse of the World Trade Center but probably not even then. Johninwiki ( talk) 01:10, 25 April 2009 (UTC) Way way too much detail and wouldn't belong here anyway. Johninwiki ( talk) 01:26, 24 April 2009 (UTC) Is the explanation I wrote above conform with the article writing rules of Wikipedia ? I would like to include it in the main article but would like to have acknowledgement from at least one administrator first. I also added a new part on how NIST used their findings to support their conclusions. Cs32en ( talk) 19:36, 23 April 2009 (UTC) Update:Moved the proposal here (WTC7 talk). It is in this respect that this information becomes relevant to the Seven WTC article. The detailed (and really funny) Youtube investigation is here: WTC7: NIST Finally Admits Freefall (Part I) (Part II) (Part III) Johninwiki ( talk) 02:21, 23 April 2009 (UTC) The fact that NIST corrected its findings should be related to how NIST used these findings to support its conclusions. Is it possible to include this information, or are there any reasons why it can/should be excluded? Steel samples were removed from the site before the NIST investigation began.ĭownward velocity of north face roofline as WTC7 began to collapse For the investigation, the NIST investigators did not look at actual steel samples from WTC 7. The symmetric appearance of the downward fall of the WTC 7 that could be observed was primarily due to the greater stiffness and strength of its exterior frame relative to the interior framing. Stage 3 (4.0 to 5.4 seconds): decreased acceleration, due to increased resistance from the collapsed structure and debris below.Stage 2 (1.75 to 4.0 seconds): gravitational acceleration (free fall), indicating no support from the structure below.Stage 1 (0 to 1.75 seconds): acceleration less than free fall, due to buckling of exterior columns in the lower stories.Different from the previous report assuming the building to descend at an approximately constant speed, does the new report assume an approximately constant acceleration in three phases: (confer NIST q&a page as well as the attached image) I propose to add details from the final NIST report and the q&a section on NIST's website.Īfter critics on the previous report have been raised during the NIST WTC7 technical briefing on Aug.2008, the revised final report was published in Nov.2008.
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