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  1. #1
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    AVT-E nose and base bomb fuze, Russia

    Cutaway model of a Russian AVT-E nose and tail fuze. The fuze is elctrically activated, after which the fuze is a mechanical activated allways fuze. The fuze in the picture is pictured in armed condition.

    The fuze is 203mm long and the top part has a ø60mm diameter.

    The fuze consists of three main parts; the top part (1), housing the electrically served arming part (2), the lower part (3) with the all ways fuze (4) and the pyrotecnic delay elements (5). Below that , the booster (6) is placed.

    The fuze is screwed into the nose or base of a bomb and the electric connector ball (7) on the wire is placed into the electric connection piece of the bomb rack, closing the electric circuit. An electric firing cap (8) which –when electrically powered- ignites two delay pellets (9, yellow). When these are burned through, they ignite a explosive powered piston (10) which is fired into the direction of the centerline (red arrow). Due to the speed of the piston movement the horizontal arming pin (11, pict 02) is projected outward, locked by the cone shaped end of the hole.
    In the lower part of the fuze the allways fuze is placed. When the fuze is in safe condition, the arming piston (12) is in it’s lower position, locking the allways fuze in safe condition. The firing pin (13, light blue) is placed in the upper telescoped cilinder(14) of the all ways fuze, the firing (16) cap is placed in the lower telescoped cilinder (15) of the all ways fuze. A light pressure spring is placed between the upper and lower telescoped cilinders, keeping them apart when armed. When in safe position, the firing cap (16) is kept out of line by the firing pin protruding through the lower telescoped cylinder (15). When the fuze is armed the firing pin is retracted and the firing cap is pushed in the centerline by a light radial spring, and locked in position by a locking pin.

    Below the allways fuze four radial holes are drilled in which a screw (18) is placed. By unscrewing one of the four screws a delay element (20) -or no delay (19)- is released.
    The flame of the firing cap (16) or one of the delay elements ignites a boosting firing cap (21) that ignites the detonator (22), which ignites the booster (6). This will ignite the bomb.

    Functioning:
    While the bomb is ejected the electric circuit is powered , causing the horizontal arming pin (11) to be pushed away after a short delay. This allows the arming piston to move upward and activate the allways fuze. The firing pin is retraced upward, the firing cap is placed in line and locked and the fuze is armed.
    When the bomb lands on it’s noze or tail the firing pin cilinders is telescope in the firing cap cilinder or vica versa, when the bomb lands on it’s side the conical ends of the cilinders move sideways in the conical shaped inside of the fuze (23), forcing the firing cap and firing pin together.

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    FAB-500 M46 General purpose
    FAB-500SH General purpose 500 Kg

    Regards, DJH
    Last edited by pzgr40; 7th January 2019 at 08:43 PM.

  2. The Following 13 Users Say Thank You to pzgr40 For This Useful Post:

    1989rjb (7th January 2019), Bellifortis (8th January 2019), blu97 (8th January 2019), Darren (8th January 2019), Fusse2004 (7th January 2019), FZG76 (8th January 2019), HAZORD (7th January 2019), MINENAZ16 (8th January 2019), Nabob (9th January 2019), SG500 (7th January 2019), sgdbdr (8th January 2019), Sprockets (14th January 2019), stecol (8th January 2019)

  3. #2
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    Hallo DJH,
    thank you again for this beautiful piece of work. For quite a few years I searched for a description (which I could read) explaining the exact function of this fuze. Especially the function of the screwcap in themiddle of the top of the fuze. This makes this fuze stand out among all the others. You did not mention this very important screw cap. By turning the screwcap around you make the fuze act most sensitively. This is done with for instance firebombs, which you want to burst on the first slight contact. Attached is a foto of the key and the underside of the screwcap. Another thing. You translate the name of the fuze as AVT-E. East-German manuals name it AWT-Ä. Wishing you success with your future work, I remain,
    Bellifortis.
    P.S.: Does anybody have a foto of the "rail", where the ballcontact of the pyrotechnic igniter is introduced to make contact with the electric system of the aircraft ?
    Attached Images Attached Images
    Last edited by Bellifortis; 8th January 2019 at 06:41 PM.

  4. The Following 2 Users Say Thank You to Bellifortis For This Useful Post:

    pzgr40 (8th January 2019), Sprockets (14th January 2019)

  5. #3
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    Hi Bellifortis, thank you very much for your valuable information. I learned something today!! I had no Idea that by turning this cap around the fuze would become more sensitive as the firing pin is placed closer to the firing cap. Sounds logical!
    I had no description or TM of this fuze so I had to "reverse engineer" it's functioning. This shows why a forum like this is so important; exchange of information!!

    Many regards, DJH
    Last edited by pzgr40; 8th January 2019 at 09:36 PM.

  6. #4
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    Hi DJH,
    attached you see the fuzekeys for the above fuze. It's a picture from the russian TM for this fuze. 1-is the key to screw the fuze into the bomb , 2-is a canopener for the metalcans the fuzes are packed in , 3-is used to adjust the function of the fuze (screwdriver ?) , 4-is the key for adjusting the sensitivity of the fuze. The AVT-E TM is the only one I have seen, that gives a description of the fuze keys used.
    regards,
    Bellifortis.
    Attached Images Attached Images

 

 

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