"The buildings have been investigated and found to be safe in an assumed collision with a large jet airliner (Boeing 707 - DC 8) traveling at 600 miles per hour. Analysis indicates that such collision would result only in local damage which would not cause collapse or substantial damage to the building and would not endanger the lives and safety of occupants not in the immediate area of impact." Appendix A, NISTNCSTAR1-2, April 26, 2006 update.
"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," he said. "The building structure would still be there." John Skilling, Lead Structural Engineer for the WTC, The Seattle Times, February 27, 1993.
Kinetic Energy Calculations of Flight 11 and Flight 175 Impacts
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Formula for Kinetic Energy (KE)
KE = 0.5 · M · V2------------------------------------------------------------------------------------------------
Takeoff Weights for Boeing 767 –200ER and Boeing 707 –320B
The Maximum Takeoff Weight for a Boeing 767 -200ER is 179,170 kg
Maximum Takeoff Weight for a Boeing 707 -320B is 152,400 kg
(http://www.boeing.com/commercial/707family/product.html)------------------------------------------------------------------------------------------------
Aircraft Type, Speed and Kinetic Energy Impact Calculation the WTC Towers Were Designed to Withstand and Survive
KE of Boeing 707 at 270 m/s*
(0.5) · (152,400 kg) · (270)2= 76,200 kg · 72,900= 5,554,980,000 Joules
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Actual Aircraft Types, Impact Speeds of Flights 11 and 175 and Kinetic Energy Impact Calculations
Flight 11 Impact Speed into North Tower at 8:46:
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