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  1. #1
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    British 120mm APFSDS service projectile.

    Just a few pictures to show one of the 120mm APFSDS projectiles I've got. This one has had the bands cut so the sabot can be taken apart.

    It would be fired from a rifled gun so the rear band rotates quite freely to reduce spin.

    Dave.
    Attached Images Attached Images

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  3. #2
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    This may interest you
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    Any Live or Dug ordnance shown by me has been disposed of by military EOD personnel .



    BOCN HELPING TO PROMOTE SAFE RESPONSIBLE ORDNANCE COLLECTING


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  5. #3
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    Very Nice!

  6. #4
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    Thanks Allan & John.

    With reference to the line drawing, what is "buttress threading"?

    Dave.

  7. #5
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    quoting from the original document here as i had no idea what it was either " The
    side of the Core is buttress threaded, this connects with the thread inside the Sabot
    which prevents movement of the Core within the assembled Shot and, on firing,
    imparts drive to the Core."
    Hope this helps as nothing else is mentioned about the Buttress Threading

    Any Live or Dug ordnance shown by me has been disposed of by military EOD personnel .



    BOCN HELPING TO PROMOTE SAFE RESPONSIBLE ORDNANCE COLLECTING


  8. #6
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    Dave,

    Buttress threads are a standard design thread that you could find defined exactly in a "Machinery's Handbook" which is used by machiists. Standard threads are V shaped. Buttress threads have one side perpendicular to the axis of the threaded item, and one side angled to the axis of the dart. Buttress threads are shown:

    [ame="http://en.wikipedia.org/wiki/Buttress_thread"]Buttress thread - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:Buttress_thread_form.png" class="image"><img alt="" src="http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Buttress_thread_form.png/200px-Buttress_thread_form.png"@@AMEPARAM@@commons/thumb/6/6a/Buttress_thread_form.png/200px-Buttress_thread_form.png[/ame]

    In the case of darts and sabots, the flat side of the thread is the closest to the tip of the dart, so that it can push the dart forward. Once the assembly leaves the barrel, the angled part of the thread helps the sabot pieces break away from the dart.

    Hope this helps. Let me know if you have more questions.

    John

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  10. #7
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    Thanks for your help guys, that makes it a lot clearer now - interesting how the sabot and dart interact, I'd never thought of it like that before.

    Dave.

  11. #8
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    L23

    L23A1 and L26A1

    L27A1

    L28A1

    is L28A1 ever used ? or it's some sort of "rename" for L27 ?

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  13. #9
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    Allan & Dave.

    Is the aluminium ring at tip of the "dart" to produce a flash on armour contact, and does the combustible case at rear somehow prevent the fins (Material?) becoming distorted-it appears to be empty?
    Thanks,Martin.

  14. #10
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    Quote Originally Posted by Sprockets View Post
    Allan & Dave.
    ........and does the combustible case at rear somehow prevent the fins (Material?) becoming distorted-it appears to be empty?
    Thanks,Martin.
    Here's a picture of a sectioned 120mm to show the combustible cap that covers the fins.

    Dave.

    IMG_3078.jpg

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