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Tallboy explodes in Poland

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Tallboy explodes in Poland

Old 14th Oct 2020, 02:45
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What was the explosive used in these bombs?
Also were there few enough of them manufactured and delivered for them all to be accounted for now?
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Old 14th Oct 2020, 03:39
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Kudos to the bomb disposal unit, whomever they may have been.

Cheers,
Grog
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Old 14th Oct 2020, 03:43
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Originally Posted by kangaroota View Post
What was the explosive used in these bombs?
Also were there few enough of them manufactured and delivered for them all to be accounted for now?
Torpex explosive is 42% RDX, 40% TNT and 18% powdered aluminium.

854 built.
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Old 14th Oct 2020, 03:46
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Originally Posted by kangaroota View Post
What was the explosive used in these bombs?
Also were there few enough of them manufactured and delivered for them all to be accounted for now?
Back then TNT or Tetryl
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Old 14th Oct 2020, 04:00
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Just as a side note I have a BS in chemistry and other topics, just so that I could understand fireworks and explosives, in greater detail.

In HEX there is a pressure gradient,as gas expansion occurs, not flame expansion. The best way to delineate between HEX and LEX is that HEX exhibits the Munroe Effect... which I leave that one for Ms Google

One item at the borderline between the two is flash powder. In the US it's considered a HEX 1.1G for storage purposes. Flash does not need to be confined tightly to explode. And an explosion involving flash looks like a detonation
I don't know if flash exhibits the Munroe Effect though
​​​​

Last edited by Pugilistic Animus; 14th Oct 2020 at 04:39.
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Old 14th Oct 2020, 05:26
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Originally Posted by kangaroota View Post
What was the explosive used in these bombs?
Also were there few enough of them manufactured and delivered for them all to be accounted for now?
according to google: Torpex + some TNT.

tallboy link

"The Torpex filling was poured into the base of the upturned casing by hand, after melting it in "kettles". The final stage of explosive filling required that a one-inch layer of pure TNT be poured over the Torpex filling, followed by sealing the base with a 4-inch (100 mm) layer of woodmeal-wax composite with three cylindrical recesses fitted with the explosive boosters and into which (when the bomb was finally armed), a total of three chemical time-fuses were inserted."
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Old 14th Oct 2020, 06:19
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I just looked up Torpex it's a mix of RDX (cyclotrimethylaminetrinitramine) and TNT
'Research Department eXplosive' or Royal Demolition Explosive
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Old 14th Oct 2020, 06:51
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Originally Posted by Pugilistic Animus View Post
I just looked up Torpex it's a mix of RDX (cyclotrimethylaminetrinitramine) and TNT
'Research Department eXplosive' or Royal Demolition Explosive
plus aluminium powder (which based on what I read is rather significant element).
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Old 14th Oct 2020, 07:48
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Originally Posted by Beamr View Post
plus aluminium powder (which based on what I read is rather significant element).
I forgot that one, Al powder increases the heat of reaction thereby increasing blast wave pressure... it's also used in flash powder for creating huge booms that everyone loves during a fireworks display. Don't try this because there's many safety precautions and rules that must be followed but Flash powder ( the safest one) is 70% Potassium Perchlorate and 30% Dark pyro aluminum.

Last edited by Pugilistic Animus; 15th Oct 2020 at 14:53.
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Old 14th Oct 2020, 07:54
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No bloody intention of trying it!

My chemistry master at school had lost an eye earlier in his career when an experiment was rather more spectacular than planned, put me off making things go bang for life.
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Old 14th Oct 2020, 08:03
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Originally Posted by Waypoint Short View Post
Torpex explosive is 42% RDX, 40% TNT and 18% powdered aluminium.

854 built.
Sorry, didn't see your post at first
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Old 14th Oct 2020, 08:06
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As others have said good way of dredging canal and getting some fish as well. The Gulls were certainly in quickly. I wonder how they found it after all this time ?
Cheers
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Old 14th Oct 2020, 08:10
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Originally Posted by treadigraph View Post
No bloody intention of trying it!

My chemistry master at school had lost an eye earlier in his career when an experiment was rather more spectacular than planned, put me off making things go bang for life.
I've been making things go bang since I was 15... especially my beloved fireworks... I've synthesized TNT, Trintro aniline ( tetryl) Ethylene glycol dinitrate, And trinitrophenol (picric acid) don't ask me where I got the chemicals and the apparatus. and how did I get blasting caps Lol
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Old 14th Oct 2020, 08:17
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Originally Posted by Glevum View Post
Apparently the target was the Lützow
and the heavy cruiser Prinz Eugen. Eighteen Lancasters of 617 took part with fourteen carrying Tallboys. Escort was 127 fighters but the opposition was solely flak.

One Tallboy exploded between the Lutzow and the side of the canal smashing in her arrmour plating below the waterline and she gradually settled by the stern. As this was in shallow water her guns remained in action until the Russians occupied the port when she was blown up. The Prinz Eugen survived the raid.

Most of 617's aircraft suffered flak damage and one was lost over the target. Sadly no survivors. Apparently the RAF film unit's mosquito accompanied the raid so there maybe something on you tube.

Last edited by Brewster Buffalo; 14th Oct 2020 at 12:01.
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Old 14th Oct 2020, 08:28
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Here you go, the Lutzow raid on film (from 0:50 to 1:15 on film): https://www.britainatwar.com/2019/10...000lb-tallboy/

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Old 14th Oct 2020, 08:52
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msbbarratt

According to an article I read the other day it was found NOSE UP in the mud. Had it been 180 degrees about the effect would have been much greater!

Aaron.
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Old 14th Oct 2020, 08:53
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I think that wartime raid film shows this Tallboy making a splash in water, as there is a splash that is a lot smaller than the other Tallboys that clearly explode, and its a big enough splash to be a 12000lb Tallboy hitting the water and not going off.....and if you freeze frame both films and screen shot it, it does look very close to being the same one.....but I'm not an expert.
The ship would have been in front of the saw tooth dock structure that has been built since, but the jetty coming down from the two U-Boat pens on the opposite site appears to be roughly the same still.


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Old 14th Oct 2020, 08:56
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854 built.[/QUOTE]
Thanks for that.
Do you know how many of those were dropped?
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Old 14th Oct 2020, 09:21
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Originally Posted by GeeRam View Post
I think that wartime raid film shows this Tallboy making a splash in water, as there is a splash that is a lot smaller than the other Tallboys that clearly explode, and its a big enough splash to be a 12000lb Tallboy hitting the water and not going off.....and if you freeze frame both films and screen shot it, it does look very close to being the same one.....but I'm not an expert.
The ship would have been in front of the saw tooth dock structure that has been built since, but the jetty coming down from the two U-Boat pens on the opposite site appears to be roughly the same still.

Now that is some impressive research - nice work 👍
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Old 14th Oct 2020, 10:30
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Originally Posted by kangaroota View Post
854 built.
Thanks for that.
Do you know how many of those were dropped?[/QUOTE]
My source says 879 tallboys dropped on active service plus an unknown number used in trials.
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