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911review.com offer a reason for the flash.

Mark Ferran
 
Analysis of Aluminum Impact Flashes in the WTC Crashes

The South Tower jetliner impact exhibited flashes that have been the subject of a great deal of well-publicized but poorly-informed speculation such as a occupies much of the film In Plane Site . In the following, Mark Ferran debunks claims and implications that the flashes were due to missile strikes or the like by pointing to a reasonable explanation.

e x c e r p t
title: WTC Aluminum Impact Flashes
authors: Mark Feram
When Aluminum metal is intensely smashed and shattered or it otherwise burns in air, it emits Bright White LIGHT.

Aluminum bullets travelling at very high fps (mph) shatter/splatter completely, and almost the entire mass bursts into burning particles, and are thus such are called "pyrophoric". Depleted Uranium "Kenetic Energy" projectiles are also notoriously pyrophoric upon their impact-disintegration. The key to producing the flash is the generation of the tiny particles of (heated) metal in air. In the case of bullets, the small projectile must itself contain all the (kenetic) energy needed to shatter/splatter itself, thus speeds of about 3,000 fps are required to impart the necessary energy to a small mass such as an aluminum bullet.

1fps. = .681mph.

1mph. = 1.46fps.

"The 'vaporific effect' refers to the flash fire observed with the impact of high velocity projectiles against metallic targets. The impact produces small, finely divided particles originating from either the projectile, the target, or both. These particles are heated by the impact forces and can burn in the presence of air (oxidizer). The result is a metal-dust-type explosion.... http://www.blazetech.com/.../vaporific_effects.html
It requires only a very small amount of burning Aluminum metal to emit a white light momentarily brighter than the Sun: "Flash powder". Aluminum or magnesium powder mixed with an oxidizer results in a "flash powder" that can be used to generate a bright flash of light and a loud bang. Flash powder can be used as a light source for night photography." http://www.vectorsite.net/ttpyro_2.html Similarly, an aluminum "cotton" fiber was used in older "flash cubes" to simulate sunlight for cameras.

A large piece of aluminum moving at a lesser speed than that speed which completely and entirely shatters/splatters the whole mass of the aluminum metal, is also likely to emit some aluminum particles and hence a flash of light, at the leading point of impact, because the whole mass of the rigid metal object contributes energy to shatter/splatter the smaller mass of aluminum at the leading point of impact.

General Partin says vonKleist omits the most obvious explanation. "It's very simple," he told The New American, "When the noses of the aircraft hit the buildings, you have a bright aluminum flash, the same as we saw at the Pentagon. That's obvious to anyone familiar with physics, chemistry, and what happens when aluminum hits a structure at a high rate of speed." And the proof of that analysis, the general points out, is in vonKleist's own video. "If you watch just a few frames after the nose flash, you'll see two smaller aluminum flashes as each engine strikes the building. That's all it is."
http://www.thenewamerican.com/artman/publish/printer_1253.shtml
At this link is a video of a small "F4" aircraft on a track crashing in a test to assess the safety of a nulcear reactor. http://www.jokaroo.com/extremevideos/plane_vs_wall.html

The F4 plane apparently has a non-aluminum nose-cone, however when the first metal (aluminum?) part of the nose strikes the concrete wall, a small White Flash of light is distinctly visible in the video (see the especially the second view with the aircraft approaching from the right).

Although "aluminum flash" is easily and typically observed with small projectiles (bullets) at self-shattering/splattering speeds (e.g., above 3000 fps), if you strike a small piece of aluminum metal between two very heavy masses, (for example between an iron building and an aircraft traveling 500mph), some of the aluminum metal squashed between these rigid masses will be intensely heated and ejected as small hot particles which will ignite in the air, producing a bright flash of Light. The large masses (moving relatively towards each other) provide the additional energy necessary to shatter/splatter the smaller amount of aluminum and to produce the ejected particles that burn in air and emit white light.

Impact-flashes of aluminum aircraft are considered to be commonplace by experts like "General Partin", and given the obvious ignorance and bias of most of the writers and "scholars" among the 9-11 Historical Revisionists ... I have no reason to believe that such impact flashes are not commonplace. [To the right] are images capturing impact-flash of the second aluminum airplane that hit the iron WTC towers. Also note that the face of the WTC towers where clad with sheets of aluminum, which would also be a source of aluminum for impact-flashes.

"Nearly all metals will burn in air under certain conditions." http://www.eh.doe.gov/techstds/standard/hdbk1081/hbk1081c.html

Iron Burns, especially when it is red-hot, and evidently it can melt itself when it burns in a large enough pile furnace. Aluminum Burns with a Flash, especially when it is spattered/shattered at high speed, and thus finely divided and hot.

Mark Ferran BSEE scl JD mcl www.billstclair.com/ferran

site: www.billstclair.com/ferran

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