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Building Damage Pattern Compared to 757-200

Pattern of damage to buildings hit by aircraft is somewhat predictable. Function of:

  • Size, shape, mass, construction of aircraft
  • Construction of building
  • Trajectory of aircraft
  • Velocity of aircraft
Trajectory, inferred from downed lamp-posts, gives wall angle of about 45 degrees. Velocity was about 400 MPH, similar to WTC attack planes.

* At 400 MPH, velocity of jet is like bullet
* Kinetic energy ~ velocity^2
* Jets left impressions in Twin Towers all the way to ends of wings and tails because of their kinetic energy.

A 757-200 is similar in weight and speed to the 767-222s that hit Twin Towers.

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Comments by 9-11 Research added on 9/16/04

The 767 crashes left impressions out to their wingtips, but contrary to popular belief, did not sever columns out to their wingtips. The intact steel columns under at least the outer 15 feet of each wing impression are obscured by the broken aluminum cladding covering the columns.

The comparison of the jet's velocity to a bullet is somewhat misleading, since bullets travel up to an order of magnitude faster than jetliners. It is true, however, that in a 400-mph collision, the parts of a jet would tend to continue in the direction of the flight-path rather than accelerating in directions perpendicular to the flight-path. Planes tend to break up rather than bend and crumple.