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  1. #1
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    Uncommon Finnish Bomb Fuze

    Finnish Bombs from the 30s and 40s were generally armed with Bofors/Tolfvan nose bomb fuzes designed by Ernst Otto Utter, a Finnish officer who became Bofors representative in Finland before becoming Tolfvan's main technical adviser.
    My understanding is that the SKis fuze corresponds to the 1928 Utter's patent while the SKisj fuze corresponds to the 1938 Utter's patent.
    1928 patent:
    Utter's 1928 fuze patent.jpg

    1938 patent:
    Utter's 1938 Fuze Patent.jpg

    SKisj:
    SKisj.jpg

    These fuzes correspond also to the Swesdish Bofors Spetsrör m/1932-39 and Spetsrör m/41
    (BTW What SKis and SKisj stand for - S is probably sytytyskytkin = ignition fuze, but what are the other letters for?)

    However I found photographs of a Tolfvan bomb with quite different, vanes activated, fuzes (front and rear) :
    0_103cc9_e9358c0c_XXL.jpg 0_103cc0_cc200543_XXL.jpg

    Can someone identify these fuzes and furnish some data about them?
    Last edited by Dreamk; 6th August 2018 at 03:05 PM.

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    FZG76 (10th August 2018), MINENAZ16 (6th August 2018), Yodamaster (7th August 2018)

  3. #2
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    SKisj used for 12,5 kg. Skis used for 25 kg - 250 kg.

    I have original folder, but in Finnish.
    Last edited by Tmine35; 6th August 2018 at 02:07 PM.

  4. #3
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    Could you check in the Finnish leaflets what were the delays associated with both these fuzes? I understand they offered the possibilities of instant impact, and so called "short" delay and "long" delay - but what was exactly "short" and what was "long"?.
    Thanks

    BTW this is the span of the Tolfvan bomb production in 1938:
    Suomen Ilmapuolustusliiton ilmailunäyttely Helsingin Messuhallissa (nykyinen Töölön kisahall.jpg

    and a focus on the small bombs on the left side of the above display, that are in fact part of the earlier Tolfvan / Bofors series from 1930/2
    Suomen Ilmapuolustusliiton ilmailunäyttely Helsingin Messuhallissa (nykyinen Töölön kisahall.jpg

    details on these bombs can be seen in the Tolfvan catalog of 1938:
    https://digi.kansalliskirjasto.fi/pi.../347159?page=1 (up to page 19)
    or here (may be easier as teh Finnish archive site is rather slow at some times)
    https://sassik.livejournal.com/529855.html
    Last edited by Dreamk; 6th August 2018 at 03:05 PM.

  5. #4
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    Short is 15 sec, long is 9 min.

  6. #5
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    Thanks TMine!
    Can you identify the rear fuze shown here (a very bad photo - difficult to say how this fuze really looks):
    60668.jpg
    I suppose that it is the rear fuze patented by Utter and Tolfvan in 1938 as shown in this drawing
    Utter's Rear Fuze Patent.jpg
    Last edited by Dreamk; 6th August 2018 at 04:58 PM.

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