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Re: [casi] What killed a U.S. tank?



Maybe it was a weapon made of ''mirror matter'', see here:

http://news.bbc.co.uk/2/hi/science/nature/2463143.stm

and

http://www.ph.unimelb.edu.au/~foot/


Quoting Hassan <hasseini@yahoo.com>:

> http://www.armytimes.com/story.php?f=1-292236-2336437.php
>
> Army Times - October 27, 2003
>
> ‘Something’ felled an M1A1 Abrams tank in Iraq – but
> what?
> Mystery behind Aug. 28 incident puzzles Army officials
>
> By John Roos
> Special to the Times
>
> Shortly before dawn on Aug. 28, an M1A1 Abrams tank on
> routine patrol in Baghdad “was hit by something” that
> crippled the 69-ton behemoth.
> Army officials still are puzzling over what that
> “something” was.
>
> According to an unclassified Army report, the mystery
> projectile punched through the vehicle’s skirt and
> drilled a pencil-sized hole through the hull. The hole
> was so small that “my little finger will not go into
> it,” the report’s author noted.
>
> The “something” continued into the crew compartment,
> where it passed through the gunner’s seatback, grazed
> the kidney area of the gunner’s flak jacket and
> finally came to rest after boring a hole 1½ to 2
> inches deep in the hull on the far side of the tank.
>
> As it passed through the interior, it hit enough
> critical components to knock the tank out of action.
> That made the tank one of only two Abrams disabled by
> enemy fire during the Iraq war and one of only a
> handful of “mobility kills” since they first rumbled
> onto the scene 20 years ago. The other Abrams knocked
> out this year in Iraq was hit by an RPG-7, a
> rocket-propelled grenade.
>
> Experts believe whatever it is that knocked out the
> tank in August was not an RPG-7 but most likely
> something new — and that worries tank drivers.
>
> Mystery and anxiety
>
> Terry Hughes is a technical representative from Rock
> Island Arsenal, Ill., who examined the tank in Baghdad
> and wrote the report.
>
> In the sort of excited language seldom included in
> official Army documents, he said, “The unit is very
> anxious to have this ‘SOMETHING’ identified. It seems
> clear that a penetrator of a yellow molten metal is
> what caused the damage, but what weapon fires such a
> round and precisely what sort of round is it? The bad
> guys are using something unknown and the guys facing
> it want very much to know what it is and how they can
> defend themselves.”
>
> Nevertheless, the Abrams continues its record of
> providing extraordinary crew protection. The four-man
> crew suffered only minor injuries in the attack. The
> tank commander received “minor shrapnel wounds to the
> legs and arms and the gunner got some in his arm” as a
> result of the attack, according to the report.
>
> Whatever penetrated the tank created enough heat
> inside the hull to activate the vehicle’s Halon
> firefighting gear, which probably prevented more
> serious injuries to the crew.
>
> The soldiers of 2nd Battalion, 70th Armor Regiment,
> 1st Armor Division who were targets of the attack
> weren’t the only ones wondering what damaged their
> 69-ton tank.
>
> Hughes also was puzzled. “Can someone tell us?” he
> wrote. “If not, can we get an expert on foreign
> munitions over here to examine this vehicle before
> repairs are begun? Please respond quickly.”
>
> His report went to the office of the combat systems
> program manager at the U.S. Army Tank-automotive and
> Armaments Command in Warren, Mich. A command spokesman
> said he could provide no information about the
> incident.
>
> “The information is sensitive,” he said. “It looks
> like [members of the program manager’s office] are not
> going to release any information right now.”
>
> While it’s impossible to determine what caused the
> damage without actually examining the tank, some
> conclusions can be drawn from photos that accompanied
> the incident report. Those photos show a pencil-size
> penetration hole through the tank body, but very
> little sign of the distinctive damage — called
> spalling — that typically occurs on the inside surface
> after a hollow- or shaped-charge warhead from an
> anti-tank weapon burns its way through armor.
>
> Spalling results when an armor penetrator pushes a
> stream of molten metal ahead of it as it bores through
> an armored vehicle’s protective skin.
>
> “It’s a real strange impact,” said a source who has
> worked both as a tank designer and as an anti-tank
> weapons engineer. “This is a new one. … It almost
> definitely is a hollow-charge warhead of some sort,
> but probably not an RPG-7” anti-tank rocket-propelled
> grenade.
>
> The well-known RPG-7 has been the scourge of lightly
> armored vehicles since its introduction more than 40
> years ago. Its hollow-charge warhead easily could
> punch through an M1’s skirt and the relatively thin
> armor of its armpit joint, the area above the tracks
> and beneath the deck on which the turret sits, just
> where the mystery round hit the tank.
>
> An RPG-7 can penetrate about 12 inches of steel — a
> thickness far greater than the armor that was
> penetrated on the tank in Baghdad. But the limited
> spalling evident in the photos accompanying the
> incident report all but rules out the RPG-7 as the
> culprit, experts say.
>
> Limited spalling is a telltale characteristic of
> Western-manufactured weapons designed to defeat armor
> with a cohesive jet stream of molten metal. In
> contrast, RPG-7s typically produce a fragmented jet
> spray.
>
> The incident is so sensitive that most experts in the
> field would talk only on the condition that they not
> be identified.
>
> One armor expert at Fort Knox, Ky., suggested the tank
> may have been hit by an updated RPG. About 15 years
> ago, Russian scientists created tandem-warhead
> anti-tank-grenades designed to defeat reactive armor.
> The new round, a PG-7VR, can be fired from an RPG-7V
> launcher and might have left the unusual signature on
> the tank.
>
> In addition, the Russians have developed an improved
> weapon, the RPG-22. These and perhaps even newer
> variants have been used against American forces in
> Afghanistan. It is believed U.S. troops seized some
> that have been returned to the United States for
> testing, but scant details about their effects and
> “fingerprints” are available.
>
> Still another possibility is a retrofitted warhead for
> the RPG system being developed by a Swiss
> manufacturer.
>
> At this time, it appears most likely that an RPG-22 or
> some other improved variant of the Russian-designed
> weapon damaged the M1 tank, sources concluded. The
> damage certainly was caused by some sort of
> shaped-charge or hollow-charge warhead, and the
> cohesive nature of the destructive jet suggests a more
> effective weapon than a fragmented-jet RPG-7.
>
> A spokesman for General Dynamics Land Systems, which
> manufactures the Abrams, said company engineers agree
> some type of RPG probably caused the damage. After
> checking with them, the spokesman delivered the
> manufacturer’s verdict: The tank was hit by “a
> ‘golden’ RPG” — an extremely lucky shot.
>
> In the end, a civilian weapons expert said, “I hope it
> was a lucky shot and we are not part of someone’s test
> program. Being a live target is no fun.”
>
> *John Roos is editor of Armed Forces Journal, which is
> owned by Army Times Publishing Co.
>
>
>
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