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 Major media and government officials tell us that
impact of commercial aircraft and the ensuing fires led to the “collapse” of the North and South towers of the WTC
             … gravitational collapses
rodger herbst.
 I have a bachelors degree in aero/astro engineering
 degree in mechanical engineering from Ohio State University
23 years of experience in flight controls and simulation engineering with the Boeing Company.
I have been following the issue of the destruction of the WTC towers since about 2003
 from my paper on the AE911Truth website “Mysteries of the Twin Towers”  a survey of the available  evidence on the destruction of the twin towers”. All material presented here has been documented in that paper.
I have more slides than you probably want to see; we can stop anytime
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Wtc7 47 stories, almost half the height of the towers
Images from
1 infowars
2 ae911truth.org
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All government sponsored studies  assumed the original hypothesis of impact and/or fire to be correct.
To this day, this hypothesis has not been proved.
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In the midst of all this, NIST admits “ we are unable to provide a full explanation of the total collapse.”
In  response to a 2007 Request for Correction to NIST filed  by Steven Jones, Kevin Ryan, Richard gage & others
The RFC was denied
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 Structural engineers John Skilling and Leslie Robertson of Worthington, Skilling, Helle and Jackson (WSH&J), the Seattle based World Class structural engineering Firm of Record, worked on the project.
Groundbreaking 1966; completed 1970
designed to withstand impact of the largest commercial airliner at that time: boeing 707
Comparable to 767
John Skilling on Boeing 707 aircraft impact:
“…all the fuel would dump into the building.
 There would be a horrendous fire..”
“The building structure would still be there”.      
 
Seattle Times 1993
Skilling died in 1998
Robertson bought the official story, one of witnesses to molten metal in wtc basements; still alive, still designing buildings
Firm is Now Magnusson Klemencic Associates
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Oriental starting on Feb. 2009.
50 story  520-foot-tall skyscraper in Beijing
 was engulfed within 20 minutes, and burned for at least 3 hours
No major portions collapsed
Feb.  2005, Hotel windsor, Madrid spain, which  burned for 2 days.
Its structural core was weaker than that of the WTC towers,
several top floors collapsed onto lower ones,  the overall structure did not collapse. [125]
The 1991 Meridian Plaza fire in Philadelphia burned for 19 hours but did not cause the building to even crack. [123] The First Interstate Bank Building in Los Angeles burned for more than 3 hours with bright intense flames. There was no damage to the main structural members [124]. On
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Not much media coverage on this
Wiliam rodriguez: hero janitor with Bush: unlocked doors in N tower, saved hundreds
he and other witnesses felt explosions in the basement before aircraft impact
Fire fighter Louie cachioli in sept 12 2001 People magazine “We think there was bombs set in the building”
Grahme McQueen:
Still, even after applying a fairly stringent set of criterion for what constitutes expression of a belief in the “explosive hypothesis (EH)” versus a “non-explosive hypothesis”(NEH), he finds 118 out of 503 witnesses chose an EH, while only 10 chose an NEH. [87]
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2001:
Hugo bachmann prof emeritus
Swiss Federal Institute of Technology: either impact and fire, or demolition; both hypothesis SB investigated
Van romero: stated in albequirque journal that explosives had been used
A week later another article appered: “it was certainly impact and fire”
Had a contract with the Pentagon pending
2007: Danny Joewenko Confirms WTC7 CD in august 2011, he drove into a tree and was killed
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Flight 11 hits n tower
Flight 175 his s tower
$elling out the Investigation
On January 4, 2002, an editorial in Fire Engineering, a trade magazine with ties to the New York Fire Department, called the investigation into the collapse of the WTC a "half-baked farce." The article pointed out that the probe had not looked at all aspects of the disaster and had limited access to documents and other evidence. Bill Manning, editor of the magazine, noting that destruction of  evidence is illegal,  demanded that the destruction and removal of the steel columns must stop immediately. [162] The City of New York to rapidly recycled the 300,000 tons of steel columns, beams and trusses from the WTC in the days immediately after 9/11.
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NIST analysis only done up to the time the upper block hit the lower block:
That’s figure 4
1 kerosene fuel heats damaged columns
2 columns weaken and sag
3 more columns break
4 all support in impact floors gives way; upper block impacts lower block
5 begins global collapse
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in case you have trouble reading the mantra, that was on purpose
We needed space to put the important fact:
There was no analysis for the global collapse,
But that was the important one !!!
The one that killed thousands
The change in potential energy due to downward movement of building mass 
above the buckled columns exceeded the strain energy that could have been 
absorbed by the structure. Global collapse then ensued.”
(Repeated 12 times in the NIST report)
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 a number of problems with the NIST mantra, including violating the principles of elasticity
Upper block will be eroded as well as lower block
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Large angular momentum; expect block to continue to rotate
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But the biggest problem is that there was no upper block, in either tower
Here is NIST’s “gravitational collapse”
The angular momentum is stopped in mid air
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MttRichard Gage of AE911Truth made this observation
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Test trusses loading?
WTC trusses 35 ft to 60 ft
Test trusses: sagged 4 inches in 60 minutes
                              6 inches in 100 minutes
NIST: model shows trusses sagged 40 inches
jet fuel produces a maximum temperature of 1000 deg. C
Only a small % of the steel was directly heated
Several sources show maximum temperature achieved in fire testing of unprotected steel supports [in the U.K., Japan, the U.S. and Australia] was also 360 degrees C
That’s because steel conducts heat rapidly away from the heat source
Kevin Ryan manager at UL: wrote to NIST pointing out the contradiction
Promptly fired
(ASTM E119, with a max temperature of almost 1000 deg. C)
Steel melts at 1500 deg. C.
Kevin Ryan, manager at UL
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entitled "Collapse: How the Towers Fell."  According to the show's experts, although jet fuel might optimally reach temperatures approaching 2000deg F, fully one-half of [ Flight 11's] fuel burned outside of the tower.
This is consistent with sources which state that each aircraft was carrying about 10,000 gallons of fuel [139], and with FEMA’s estimate that about 4000 gallons of fuel burned within each tower. [140]
The remaining half, which ignited inside the tower, burned up in about eight minutes. And that analysis was based on the first crash (8:46 am), into the North tower. As can be clearly seen in video footage, a much higher percentage of the fuel burned outside the South Tower, in the second crash (9:03 am).
Chapter 9 notes that at 9:03 flight 175 hit the South tower, crashing thru the 77th to 85th floors. “The plane Banked as it hit…, leaving portions of the building undamaged on impact floors. As a consequence--and in contrast to—the…North Tower, stairwell A initially remained passable from at least the 91st floor down, and likely from top to bottom.”  [168]
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entitled "Collapse: How the Towers Fell."  According to the show's experts, although jet fuel might optimally reach temperatures approaching 2000deg F, fully one-half of [ Flight 11's] fuel burned outside of the tower.
This is consistent with sources which state that each aircraft was carrying about 10,000 gallons of fuel [139], and with FEMA’s estimate that about 4000 gallons of fuel burned within each tower. [140]
The remaining half, which ignited inside the tower, burned up in about eight minutes. And that analysis was based on the first crash (8:46 am), into the North tower. As can be clearly seen in video footage, a much higher percentage of the fuel burned outside the South Tower, in the second crash (9:03 am).
Chapter 9 notes that at 9:03 flight 175 hit the South tower, crashing thru the 77th to 85th floors. “The plane Banked as it hit…, leaving portions of the building undamaged on impact floors. As a consequence--and in contrast to—the…North Tower, stairwell A initially remained passable from at least the 91st floor down, and likely from top to bottom.”  [168]
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Chapter 9 of report
The authorities allowed  relatives to hear this tape only if they agreed they would not discuss its contents
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110 stories; 1375 ft
244  Perimeter columns 47 Core columns
NIST: loads on perimeter columns increased by up to 25%.
ENR: loads on perimeter columns could be increased by a factor of 20 (2000 %) without failing.
(ENR) engineering news record, a trade magazine covering the building of the WTC Towers,
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Mtt
40 % of steel beams torn away, but they did not collapse
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9 of 47 core columns severed
15% of 244 peripheral columns broken
south tower fell first
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Mtt
About 14-16 seconds according to Jim Hoffman. while freefall would have been about 10 second
400 structural connections/second had to break in sequence
 
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FEMA study as well as NYT note  the transmission antenna on N tower moved downward and laterally slightly before movement was evident at the exterior wall.
NIST says this movement was lateral, but did not resolve the motion into downward and lateral components
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mtt
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Mtt
On right: steel structure weighing twice a Boeing 767 imbedded into WTC3 (world financial center)
On left: trajectory of structure into WFC3
Mage on left from abovetopsecret.com
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mtt
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mtt
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Mtt
One of these pieces comes from one of the towers, the other from Building 7
Recommendations in Appendix C of the FEMA WTC report noted: "The severe corrosion and subsequent erosion of samples 1 and 2 are a very unusual event. No clear explanation for the source of the sulfur has been identified… A detailed study into the mechanisms of this phenomenon is needed."
[157] A New York Times article noted that pieces of steel were found that were "apparently melted and vaporized not solely because of the heat of fires, but also because of a corrosive contaminant that was somehow released in the conflagrations."
The New York Times called these findings
"perhaps the deepest mystery uncovered in the investigation." [158]
"A one-inch column of steel has been reduced to half-inch thickness. Its edges--which are curled like a paper scroll—have been thinned to almost razor sharpness…Gaping holes--some larger than a silver dollar--let  light shine through a formerly solid steel flange. This Swiss cheese appearance shocked all of the fire-wise professors, who expected to see distortion and bending--but not holes."
[160] Swiss cheese steel shocks professors:: www.wpi.edu/News/Transformations/2002Spring/steel.html
One unrealistic study hypothesized the sulfur could have come from acid rain
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mtt
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Iron and steel both melt at about 1500 deg C
See ash and molten metal in a thermite experiment
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Steel is not iron; where did iron come from?
% of dust red and grey chips?
Red and grey chips can still be ignited
Red layer: high tech  nano particles, had to be produced in a very high tech lab
 
Heating of red/grey chips produces metallic microspheres
Thermate produces metallic microspheres
Suggests  a link between the red and grey chips and thermate
WTC dust samples were analyzed by scanning electron microscopy and x-ray energy dispersive spectroscopy (X-EDS). T
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 mtt
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WSH&J, Now Magnusson Klemencic Associates
Major modern high rise structures
throughout the world, including Seattle
Columbia Center Seattle
In 2008 I called Jon Magnusson’s office & spoke with his secretary
I mentioned that a number of engineers had issues with the NIST study
His secretary replied that he had issues as well, but would not go into any detail
 
Sent an email invitation to Mr Magnusson to come to a local 911 event
Actually got a polite response, that he was understandably previously engaged
Image from city-data.com
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2008: letters sent to Seattle engineering firms
Earl Sutherland, CEO, 
Earl Sutherland & Associates:
“… To me it was incredible that there appeared to be no real investigation of the event…"
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mtt
Reports supporting the official investigations  do not cohere. Sometimes their conclusions are even contradictory.
 
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mtt
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Mtt
Specifically in NFPA 921 18.3.2 'High Order Damage'- 'High-order damage is characterized by shattering of the structure, producing small, pulverized debris. Walls, roofs, and structural members are splintered or shattered, with the building completely demolished. Debris is thrown great distances, possibly hundreds of feet. High-order damage is the result of rapid rates of pressure rise.' World Trade Center’s 1, 2, and 7 all clearly met this definition; therefore they should have been thoroughly investigated and analyzed for explosives. ...
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Interestingly, there is a strong coorelation
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50 experts in structural, metalurigical and chemical engineering, physics, architecture, psychology,
Free showings in Seattle and Redmond
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 mtt
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The 1375 ft. tall towers of 110  12.5 ft. floors consisted of a perimeter of 244 structural steel columns forming a square plan, with horizontal bracing (spandrels) and extremely rigid chamfered corners.
The peripheral steel columns from the 9th through the 106th floors spanned three floors vertically, and were built into massive steel wall sections measuring about 10 ft wide by 27.5 ft. (three floors) tall, consisting of three 14 inch square hollow box columns spaced three ft. four inches apart, and welded to thick steel plate spandrels.
The building core, of dimensions 79X139 ft., was a veritable forest of 47 columns, horizontal and diagonal cross braced, which housed primarily elevator shafts.
The 47 core columns varied in thickness with floor height. Individual core columns in the lower core measured 52 x 22 in. (in plan), and were formed of 5 and 3 inch plate into almost solid steel shafts that weighed up to 56 tons. [220] Other sources, including FEMA, note the average core box column cross section to be 12" wide x 36" deep x 2" thick, having a cross sectional area of 176 square inches. The box cross section construction changed to relatively light I-beam cross section above the 85th floor.[221] Hufschmid indicates the perimeter columns also decreased in thickness with increasing floor height. [222] Each tower weighed 500,000 short tons or 454545 metric tons ( 1 metric ton=1.1 short ton). The intact 16 story section above aircraft impact weighed 58,000 metric tons. Thus, the upper 16 of the 110 floor system, or 14.5 % of the floors, weighed only about 12.7 % of the total building weight, so the majority of the mass per floor was in the lower floors. [223]
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It has already been established that the “descending block” scenario was fictitious; there were no descending upper blocks impacting lower blocks. But for the sake of argument, suppose there had been. Suppose an upper block had hit a lower block. Stress and strain energy are in the domain of the theory of elasticity, yet NIST provides no elasticity analysis to substantiate its position. Fundamental to application of the theory of elasticity to the WTC North Tower collapse is the fact that impact of the theoretical “upper block” with the “lower block” will not just stress the topmost floor of the lower block; rather, the stress will be propagated rapidly downward and upward to the rest of the floors. This propagation will absorb energy, and the question is, as in the case of an elastic spring, how much energy can the structure absorb without breaking. Manuel Garcia, in an article for Counterpunch, says that he takes up the analysis of the collapse of the towers “where NIST left off” in describing the floor-by -floor collapse, but makes the same assumption as NIST, that the energy of descending floors is more than the structure can absorb. He does not consider the benefit of elasticity is absorbing energy, but only looks at the destructive aspects of the descending “wave train.” [240]
Gordon Ross has applied the theory of elasticity in a comprehensive way to the descending block scenario to show that even had it existed,  the momentum of the upper impacting block would be absorbed during the three percent elongation phase of the steel columns of the very top floor, and therefore collapse would not proceed. [241] The NIST mantra remains unproven
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It has already been established that the “descending block” scenario was fictitious; there were no descending upper blocks impacting lower blocks. But for the sake of argument, suppose there had been. Suppose an upper block had hit a lower block. Stress and strain energy are in the domain of the theory of elasticity, yet NIST provides no elasticity analysis to substantiate its position. Fundamental to application of the theory of elasticity to the WTC North Tower collapse is the fact that impact of the theoretical “upper block” with the “lower block” will not just stress the topmost floor of the lower block; rather, the stress will be propagated rapidly downward and upward to the rest of the floors. This propagation will absorb energy, and the question is, as in the case of an elastic spring, how much energy can the structure absorb without breaking. Manuel Garcia, in an article for Counterpunch, says that he takes up the analysis of the collapse of the towers “where NIST left off” in describing the floor-by -floor collapse, but makes the same assumption as NIST, that the energy of descending floors is more than the structure can absorb. He does not consider the benefit of elasticity is absorbing energy, but only looks at the destructive aspects of the descending “wave train.” [240]
Gordon Ross has applied the theory of elasticity in a comprehensive way to the descending block scenario to show that even had it existed,  the momentum of the upper impacting block would be absorbed during the three percent elongation phase of the steel columns of the very top floor, and therefore collapse would not proceed. [241] The NIST mantra remains unproven
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Mtt
“A critical analysis of the collapse of WTC towers 1,2,&7…..”
Brent Blanchard aug 8 2006
C-2006 www.implosionworld.com
Saved locally as WTC.pdf
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mtt