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Thread: Ratio of uxb

  1. #11
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    The Journal Vol. 156, No. 1 of June 1947 of the Institution of Mechanical Engineers gives the following percentage of UXO's of German bombs dropped on the UK.

    Greetings - Antoon


    IMG_4162.jpg
    Last edited by Antoon; 23rd March 2020 at 01:58 PM.

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    MINENAZ16 (23rd March 2020)

  3. #12
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    Did they give any information on how they came up with those figures? It would be interesting to know how they calculated it then, and based off what data.
    All dug or live ordnance shown in my posts is under EOD control and has been or will be dealt with accordingly by EOD personnel

  4. #13
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    The writer of the article was H.J. Cough, former chairman of the Unexploded Bomb Committee during WW-2 in the UK. So I think he was close to the actual information in that time.
    The article gives also the following information:
    By the end of 1945 more than 50,000 high-explosive enemy bombs of 50 kg or over had been dealt with in Great Britain alone. The total number of high-explosive bombs dropped is not accurately known. Table 2. (see previous post)
    taken from census figures collected during the most active period of enemy raiding, shows that about 8 per cent failed to explode; during the sporadic raids of 1943 and 1944, an average figure of 20 per cent was approached.

  5. #14
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    Hallo,
    about 10% is also the figure I read in german EOD reports of WW2. But, nearly every day, since 1945, more duds are unearthed. So, the percentage is rising all the time. A test, like that described above, where you can account for every single round, is something completely different from field-use.
    Bellifortis.

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    bacarnal (26th April 2020)

  7. #15
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    The percentage is not rising if you do not know the numbers dropped. You never had a percentage to begin with. A test will always be different from the field, but it gives a baseline for understanding, something to build on and estimate from. The minute that you say you do not accurately know the number dropped however, you have nothing but guesswork. There has to be some basis for the estimated percentage. If you know how many were dropped you can then look at how many you've found and even estimate how many more you may find - based on data.
    All dug or live ordnance shown in my posts is under EOD control and has been or will be dealt with accordingly by EOD personnel

  8. #16
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    Hallo,
    you are right with that @US-Subs,
    I do not know how the germans came to that average 10% figure for allied duds. For german bombs in WW2 about the same average dud rate is reported. Between 7% to as high as 15%. The dud rate increased steadily from summer to winter. Many of the problems were found to have resulted from bad storage in the field of fuzed bombs, so that moisture could enter into the fuze. The allied mechanical fuzes had other problems.
    regards,
    Bellifortis.

  9. #17
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    "The article gives also the following information:
    By the end of 1945 more than 50,000 high-explosive enemy bombs of 50 kg or over had been dealt with in Great Britain alone. The total number of high-explosive bombs dropped is not accurately known. Table 2."

    The key word appears to "dealt" implying that action was taken. These figures would thus include "nuisance bombs" (Delayed Action) of which both the British and Germans both used in quite high percentage. These can't be classed as malfunctions.

    The figures don't state when the bombs that were dealt with, were dropped. During WWII British Bomb Disposal was inudated with unexploded bombs and the only way to cope was to prioritise the incidents. A lot of low priority incidents were put aside for a very considerable time.

    TimG

 

 
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