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Tallboy explodes in Poland

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Tallboy explodes in Poland

Old 13th Oct 2020, 17:55
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Tallboy explodes in Poland

Sorry, can't fathom links but the Beeb are reporting that a WW2 Tallboy bomb that was being defused in Poland has exploded.
No casualties and the bod in charge says " The bomb no longer poses a risk."! Which is one way of looking at it!
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Old 13th Oct 2020, 18:52
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They don't make them like they used to.
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Old 13th Oct 2020, 18:54
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What's the Polish for "That's a much bigger bang than the one we were expecting."
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Old 13th Oct 2020, 19:03
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https://www.bbc.com/news/world-europe-54522203
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Old 13th Oct 2020, 19:08
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To znacznie większy huk niż ten, którego się spodziewaliśmy
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Old 13th Oct 2020, 19:29
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It was a heck of a 'deflagration'
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Old 13th Oct 2020, 19:47
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That's one way of dredging the canal..............................that'll be a nice big crater in the canal bed.
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Old 13th Oct 2020, 22:12
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I don't know how it was situated on the canal bed, but I can't help but feel the bang would have been bigger if all 2.5+tons of explosive had gone off with the full, original as-new blast energy. Perhaps some of it had degraded, or perhaps it was quite well embedded in the mud (they were designed as ground penetrators), or (just as likely) I don't know what 2.5 tons of explosive looks like when it goes off under water!

Still, pretty impressive none the less, nice of someone to put up a camera drone, and clearly it was a disposal job professionally done
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Old 13th Oct 2020, 22:14
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I took the car ferry across there few years back.
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Old 13th Oct 2020, 22:40
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[QUOTE=msbbarratt;10903934]I don't know how it was situated on the canal bed, but I can't help but feel the bang would have been bigger if all 2.5+tons of explosive had gone off with the full, original as-new blast energy. Perhaps some of it had degraded, or perhaps it was quite well embedded in the mud (they were designed as ground penetrators), or (just as likely) I don't know what 2.5 tons of explosive looks like when it goes off under water!

Still, pretty impressive none the less, nice of someone to put up a camera drone, and clearly it was a disposal job professionally done [/QUOTE

Imagine that seventy-five years ago, hundreds of them, falling and exploding all over the place😮
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Old 13th Oct 2020, 22:45
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What were they aiming for that was in Poland?
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Old 13th Oct 2020, 23:01
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That’s one way to go fishing.
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Old 13th Oct 2020, 23:07
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Apparently the target was the Lützow

https://www.bbc.co.uk/news/world-europe-54522203
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Old 13th Oct 2020, 23:18
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Great pictures - but where's the bang??!!!
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Old 13th Oct 2020, 23:36
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[QUOTE=Neektu;10903949]
Originally Posted by msbbarratt View Post
I don't know how it was situated on the canal bed, but I can't help but feel the bang would have been bigger if all 2.5+tons of explosive had gone off with the full, original as-new blast energy. Perhaps some of it had degraded, or perhaps it was quite well embedded in the mud (they were designed as ground penetrators), or (just as likely) I don't know what 2.5 tons of explosive looks like when it goes off under water!

Still, pretty impressive none the less, nice of someone to put up a camera drone, and clearly it was a disposal job professionally done [/QUOTE

Imagine that seventy-five years ago, hundreds of them, falling and exploding all over the place😮

The Tallboy was an earth penetrating bomb designed by Barnes Wallace for use on specific targets. They were never hundreds exploding all over the place. It could penetrate 16 feet of concrete, which gave a surprise to those in U boat pens.
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Old 14th Oct 2020, 00:04
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Originally Posted by Sidestick_n_Rudder View Post
It was a heck of a 'deflagration'
https://www.youtube.com/watch?v=-iSRkvAupT8
Not a deflagration, a detonation.. deflagration is for low explosives like black powder...HEX detonates and exhibits Munroe Effect
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Old 14th Oct 2020, 00:37
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[QUOTE=Fourteenbore;10903986]
Originally Posted by Neektu View Post


The Tallboy was an earth penetrating bomb designed by Barnes Wallace for use on specific targets. They were never hundreds exploding all over the place. It could penetrate 16 feet of concrete, which gave a surprise to those in U boat pens.
That depends on the pen I suppose. I did a tour of the Keroman base in Lorient last year. It took a direct hit from a tallboy. The bomb went through the first few 2 metres of concrete but then dissipated in the blast void above the main 4 metre roof.
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Old 14th Oct 2020, 02:37
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The article states,
Naval forces used a remote-controlled device to try to "deflagrate" the bomb - a technique that if successful burns the explosive charge without causing a detonation, the deflagration process turned into detonation.
How would they attempt to deflagrate the bomb, and why would the process then fail and cause an explosion?

Deflagration and detonation are two ways energy may be released. If the combustion process propagates outward at subsonic speeds (slower than the speed of sound), it's a deflagration. If the explosion moves outward at supersonic speeds (faster than the speed of sound), it's a detonation.

While the action of deflagration is to push the air in front it, objects do not explode because the rate of combustion is relatively slow. Because the action of detonation is so rapid, however, detonations result in shattering or pulverizing objects in their path.


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Old 14th Oct 2020, 03:00
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Exactly like you said Megan...you got it right!
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Old 14th Oct 2020, 03:07
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Tis OK, found the answer to my question. In some situations, a subsonic flame may accelerate into a supersonic flame. This deflagration to detonation is difficult to predict but occurs most often when eddy currents or other turbulence are present in the flames. This can happen if the fire is partially confined or obstructed.
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