|FAQ #9: Were the Twin Towers Designed to Survive the Impact of the Airplanes?|
|Written by AE911Truth Staff|
|Tuesday, 21 August 2012 18:23|
Both technical calculations and testimony from WTC structural engineers confirm that the Twin Towers were built to withstand the impact from the passenger jets that hit them on 9/11.
Airplane impact tests conducted by WTC structural engineers during the design of the Twin Towers used the Boeing 707, which was one of the largest passenger jets in the world at the time. The results of the test, carried out early in 1964, calculated that the towers would handle the impact of a 707 traveling at 600 mph without collapsing.
Even though the two Boeing 767 aircraft that were said to be used in the 9/11 attacks were slightly larger than the 707, technical comparisons show that the 707 has more destructive force at cruising speed. The following analysis was compiled by 911research.net:
The maximum takeoff weight for a Boeing 707-320B is 336,000 pounds.
So what can be said about the actual impacts?
When interviewed in 1993, Lead WTC Structural Engineer John Skilling told The Seattle Times:
“We looked at every possible thing we could think of that could happen to the buildings, even to the extent of an airplane hitting the side… Our analysis indicated the biggest problem would be the fact that all the fuel (from the airplane) would dump into the building. There would be a horrendous fire. A lot of people would be killed. [But] the building structure would still be there.”
In 2001, Leslie Robertson, a WTC structural engineer who worked as a subordinate to Skilling, claimed that the Twin Towers were only able to withstand the impact of jet airplanes going no faster than 180 mph. However, not only are these statements contradicted by the design test results, they also contradict statements made by Robertson in 1984/1985, when he said that there was “little likelihood of a collapse no matter how the building was attacked.”
Robertson also claimed that the fires caused by a jet impact were not incorporated into the WTC design analysis. “To the best of our knowledge, little was known about the effects of a fire from such an aircraft, and no designs were prepared for that circumstance,” he stated in 2002. However, not only is this statement contradicted by Skilling, but it also lacks common sense, according to 9/11 researcher Kevin Ryan. “That’s kind of crazy… I don’t know how the planes would get to the buildings without jet fuel,” Ryan explains in a video presentation titled The NIST World Trade Center Report: A New Standard for Deception. “Who would design these buildings for jet plane impacts but not fuel fires?”
Not only were the towers designed to survive crashes of large jet aircraft, but they were designed to potentially survive multiple plane crashes. This assertion is supported by Frank A. Demartini, the on-site construction manager for the World Trade Center, who said on January 25, 2001:
“The building was designed to have a fully loaded 707 crash into it. That was the largest plane at the time. I believe that the building probably could sustain multiple impacts of jetliners because this structure is like the mosquito netting on your screen door—this intense grid—and the jet plane is just a pencil puncturing that screen netting. It really does nothing to the screen netting.”
Demartini appeared to be so confident that the towers would not collapse that he stayed behind, after the airplane impacts, to help save at least 50 people. As a result of his actions, he lost his life on 9/11.
Like the firefighters who perished in the WTC buildings, Demartini may very well have risked his life to save others, but the evidence suggests that he did not think he was endangering himself by simply going back into the building.
In addition, investigators from NIST who examined the destruction of the WTC skyscrapers told The New York Times in 2007 that newly disclosed documents from the 1960s show that the new York Port Authority, the original owners of Twin Towers, also considered aircraft moving at 600 mph,slightly faster and therefore more destructive than the ones that did hit the towers.
The information detailed in 9/11: Explosive Evidence – Experts Speak Out demonstrates clearly that pre-planted explosives – not jet plane impacts and fires – destroyed the Twin Towers. The WTC designers seemed to be correct in their analysis in the 1960s, and the evidence that these buildings were brought down by controlled demolition corroborates their conclusions.