The 9/11 Forum

Example of sound pressure levels: (http://www.aristatek.com/explosions.aspx)

Peak overpressure psi
0.04 = Very loud noise (143 dB); sonic boom glass failures
0.1 = Breakage of small windows under strain
0.15 = Typical pressure of glass failure
0.30 = 10% of windows broken
0.5 = Windows shattered, limited minor damage to house structures


Examples of overpressure from 1 kg TNT: (http://www.fas.org/man/dod-101/navy/docs/es310/warheads/Warheads.htm)

Peak overpressure psi > 0.10 at 50m
Peak overpressure psi > 0.50 at 20m (windows shattered - see above)


Examples of linear shape charges from Dynawell: (http://www.dynawell.de/explosives_lsc_tds.html)

Issue: A-2002/04 Linear Shaped Charges with Copper Sheath *

Explosive Load **[g/m]; Width ***[mm]; Height ***[mm]; Gross Weight[kg/m]; Optimum Standoff[mm]; Penetration at Optimum Standoff ****[mm]

Dynawell LC 425
425; 29,2; 26,4; 1,9; 19; 40

These indicate roughly 2kg of HE for a penetration depth of 40mm. Since the corner columns were >3 in thick, larger charges would be needed.

Here is the video taken of WTC2 from a couple 100 feet away. http://www.911research.com/wtc/evidence/videos/docs/wtc2_south_below.mpg Note that peoples voices and the sound of the collapse are rather clear.

Here are some actual controlled demolitions: (notice that the explosions are much louder than the collapses)

Landmark building, Fort Worth
Everglades Hotel
A building in Buffalo, NY

Did you know that Discovery channel added sounds of explosions to that clip you posted for the dramatic effect.

einsteen wrote:Did you know that Discovery channel added sounds of explosions to that clip you posted for the dramatic effect.

Do you mean the one I posted or this one which seems to have added effects?

WTC2:

http://youtube.com/watch?v=K8dX3foxozQ

WTC1:

http://youtube.com/watch?v=m2kn0QXkkRw&feature=related

This is loud, but there are no characteristic large booms or cracking sounds. Remember, at least for WTC2, that the charges would need to be at least as large as the Landmark building (Fort Worth).

Hambone wrote:

einsteen wrote:Did you know that Discovery channel added sounds of explosions to that clip you posted for the dramatic effect.

Do you mean the one I posted or this one which seems to have added effects?

Yes, that's the one.