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-   -   Tallboy explodes in Poland (https://www.pprune.org/aviation-history-nostalgia/636062-tallboy-explodes-poland.html)

Tashengurt 13th Oct 2020 17:55

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!

Fareastdriver 13th Oct 2020 18:52

They don't make them like they used to.

VX275 13th Oct 2020 18:54

What's the Polish for "That's a much bigger bang than the one we were expecting."

Jhieminga 13th Oct 2020 19:03

https://www.bbc.com/news/world-europe-54522203

ETOPS 13th Oct 2020 19:08

To znacznie większy huk niż ten, którego się spodziewaliśmy

Sidestick_n_Rudder 13th Oct 2020 19:29

It was a heck of a 'deflagration' :8

GeeRam 13th Oct 2020 19:47

That's one way of dredging the canal..............................that'll be a nice big crater in the canal bed.

msbbarratt 13th Oct 2020 22:12

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 :ok:

TerryCherry 13th Oct 2020 22:14

I took the car ferry across there few years back.

Neektu 13th Oct 2020 22:40

[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 :ok:[/QUOTE

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

Lookleft 13th Oct 2020 22:45

What were they aiming for that was in Poland?

West Coast 13th Oct 2020 23:01

That’s one way to go fishing.

Glevum 13th Oct 2020 23:07

Apparently the target was the Lützow

https://www.bbc.co.uk/news/world-europe-54522203

tartare 13th Oct 2020 23:18

Great pictures - but where's the bang??!!!

Fourteenbore 13th Oct 2020 23:36

[QUOTE=Neektu;10903949]

Originally Posted by msbbarratt (Post 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 :ok:[/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.

Pugilistic Animus 14th Oct 2020 00:04


Originally Posted by Sidestick_n_Rudder (Post 10903870)
It was a heck of a 'deflagration' :8
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

soarbum 14th Oct 2020 00:37

[QUOTE=Fourteenbore;10903986]

Originally Posted by Neektu (Post 10903949)


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.

megan 14th Oct 2020 02:37

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.



Pugilistic Animus 14th Oct 2020 03:00

Exactly like you said Megan...you got it right!

megan 14th Oct 2020 03:07

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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