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  ShapedCharge

[WWW]Major Pierre-Henri Bunel of the French Army was a Battlefield Damage Assessment officer during the 1991 Gulf war. He explains the physics of [WWW]Shaped Charges:

    When an explosive is ignited, it decomposes itself in heat, light and huge volume of gaseous compounds. Because this expansion is very rapid, the expanding gasses displace large volumes of air creating a shockwave and a forceful gust of wind: a blast. For 'high explosives', the shockwave occurs at supersonic speed, forcing the water steam in the air around the blast to condense instantly, thus creating a sudden white cloud or white flash. This colour may change to light yellow or light orange but the flash is always sudden and brief. The fireball follows later at a slower speed.

    Jet fuel cannot burn without large quantities of air. It only explodes when carefully mixed with air. Otherwise it just burns in dark orange falling flames like in the WTC [2 -ed] 9/11 attack.

    Normal explosives disperse their gaseous compounds in all directions. Shaped-charge explosives concentrate their gases in a single direction, making them more powerful. Metal is added to the explosive charge to increase its 'cutting power'. Shaped charges are used for piercing rocks in the oil-drilling industry, or for piercing tanks and bunkers in the army. High explosives create huge heat and huge forces. Shaped charges are even more destructive.

For an example of how shaped-charges focus their explosive force forward into a dart, see the results of a [WWW]computer simulation above. This dart is a mixture of gaseous matter and plasma which is projected forward along the axis of the parabola. Projected forward at a speed of several thousands of meters per second [several times the speed of sound] , with a temperature of several thousand of degrees Centigrade, this dart can penetrate several meters of concrete. It could easily pierce five concrete walls of a building. Five out of six, because the exterior wall is punctured by the initial explosion. The detonation of the shaped-charge in effect takes place when it is already inside the building. With delayed fusing on a dual warhead, the shaped-charge explodes within the building, which is why the flames of the explosion develop from the inside outwards.

The dart of plasma and gas ignites everything flammable in its path, and eventually cools and runs out of force. The key is that it penetrates and pierces, rather that exploding radially and dispersing. The gas will carry non-flammable debris along its course with it.

Pierre-Henri Bunel thinks that the PentagonAttack was made with an anti-bunker missile. An anti-bunker missile contains both a shaped charge and a bomb. It first used the shaped-charge to pierce the wall and then dropped a bomb inside the building.

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