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  1. #1
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    BLU-42 A/B or BLU-54 cluster mine, USA.

    Cutaway model of a BLU-42 A/B or BLU-54 cluster mine. This type of mine is also named minelet or WAAPM (Wide Area Anti Personel Mine). 540 of these mines are packed in a CBU-34 (Cluster Bomb Unit), either 540 pcs in the SUU-38A dispenser (remains underwing) which can throw out 10 canisters of 54 minelets.
    The mine exists of two machined cast steel halves, connected by means of a rolled steel band. Eight holes have been drilled in the minelet body to house the bushings that contain the trip wire reels.
    In the body, a (non type designated) fuze is placed that exits of a safe and arming mechanism, en electronic movement sensor (fuze), two electronic timers, a spider release mechanism and an electronic self destruct mechanism. The explosive charge exists of 71 grams comp. B.

    List of fuze parts:
    1- Upper fuze body half
    2- Lower fuze body half
    3- Rotor housing
    4- Cover and pivot rotor(housing)
    5- Centrifugal weights (4x)
    6- Centrifugal weights press springs (4x)
    7- Safety ring with safety fork
    8- Safety ring spring
    9- Balls (2x)
    10- Electric connector pin
    11- Electric connector pin spring
    12- Rotor
    13- Slider contact
    14- Soft rubber pressure piece for under slider contacts
    15- Axial lock up clip rotor
    16- Retaining clip gas driven piston
    17- Gas driven piston
    18- Electronic firing cap
    19- Detonator
    20- Axial retainig pin (2x)
    21- Housing spider release mechanism (2x)
    22- Spring-ring (2x)
    23- Radial release pins (2x)
    24- Spider release pin (2x)
    25- Rubber gasket
    26- Spider release mechanism housing cover (2x)
    27- Spider
    28- Electronics ring
    29- Battery with switch connector
    30- Isolator disc
    31- Gasket ring
    32- Lower ring of anti disturbance circuit
    33- Housing of anti disturbance circuit
    34- Upper ring of anti disturbance circuit
    35- Contact balls of anti disturbance circuit
    36- Tripwire with spool and spring

    Functioning of the mine:
    As each mine is released from the cluster bomb or dispenser canister, the airstream catches the flutes, spinning the mine with 2700 +/- 300 rpm. to provide the centrifugal force required to start the arming sequence. Four centrifugal weights (5) are thrown outward -overriding the springs (6) that try to keep them inward-, enabeling the safety ring (7) with the attached safety fork to move down under the influence of the spring (8) above it. This releases two balls (9) that fall outward, enabeling the electric connector pin (10) to move upward under influence of it’s spring (11), closing the electric circuit under the battery (29). Also, the safety fork –connected to the safety ring (7)- moves down, releasing the rotor (12). The Rotor has three goals: It switches the electric contacts by means of a slider contact (13), It releases the spiders (27) that releases the eight tripwires (36) and it moves away a sliding safety between the electric firing cap (18) and the detonator (19).
    As soon as the minelet hits the ground an electric switch activates a timer that provides a primary stabilization delay of 5 to 10 minutes prior to trip line deployment. At expiration of the primary stabilization delay the gas driven piston (17) is activated and pushes the rotor (12) in it’s working position. Two axial pins (20) that rest on the rotor will now fall inward together with the blade springs (22) on top of these pins (20). This will allow two radially placed pins (23) in the spider release housing (21) to move outward and free the spider release pins (24). Now the spider (27) is released and jumps away, allowing eight trip lines (36) to be deployed out to 7.62 meters (25.0 feet) from the mine. A self-destruct timer and antidisturbance firing circuit (32,33,34) are also activated at this time. As the antidisturbance firing circuit is activated, a secondary stabilization delay of 6 seconds prevents premature detonation during trip wire deployment. At the end of the secondary stabilization delay, the mine is fully armed.
    In the ideal situation, with all trip wires extended to full length, an area of 10,8x10,8 mtrs is covered, either 117 square meters.

    The mine has an electronic self destruct mechanism:
    BLU-42/B - 156 hours; 6,5 days
    BLU-42 A/B- 180 hours; 7,5days
    BLU-54/B- 1200 hours; 50 days.

    This mine was used extensively in the Vietnam War and has since been exploited and copied by the former Soviet Union under the designation POM-1S.
    The diameter of the BLU-42 A/B or BLU-54 is 60 mm.

    A special thanks to US-Subs who helped me out with info about the functioning of the fuze.


    Regards, DJH
    Attached Images Attached Images
    Last edited by pzgr40; 7th March 2010 at 11:51 PM.
    Looking for / Suche noch:
    -8,8cm Pzgr.40.
    -8,8cm D (drahtsperre)

  2. The Following 7 Users Say Thank You to pzgr40 For This Useful Post:

    Bellifortis (26th January 2019), highlandotter (29th January 2013), jonah2432 (29th March 2013), rcaf53 (30th January 2013), Sprockets (18th January 2014), Tarbelin51 (22nd May 2013), Yodamaster (26th January 2019)

  3. #2
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    BLU-42 A/B or BLU-54 cluster mine, USA , Pt2

    More drawings
    Attached Images Attached Images
    Looking for / Suche noch:
    -8,8cm Pzgr.40.
    -8,8cm D (drahtsperre)

  4. The Following 6 Users Say Thank You to pzgr40 For This Useful Post:

    highlandotter (31st May 2019), jonah2432 (29th March 2013), rcaf53 (30th January 2013), Sprockets (5th August 2013), Tarbelin51 (22nd May 2013), Yodamaster (26th January 2019)

  5. #3
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    What an amazing cutaway psgr40, thanks for posting the great photos and write up, good work!!
    Dave.

  6. #4
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    Thanks SG500. when I was able to get a -parts complete- BLU-42 I found it interesting enough to make a full study with acad drawings of the functioning of the fuze and change it into a nice cutaway model.

    regards, DJH
    Last edited by pzgr40; 8th March 2010 at 12:06 AM.
    Looking for / Suche noch:
    -8,8cm Pzgr.40.
    -8,8cm D (drahtsperre)

  7. #5
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    Very thorough explanation and very nice sectioning DJ! You must have clones that work on this stuff 24/7. Amazing!
    ___HAZ/
    _____/ORD Hazardous Ordnance Recognition
    ________Saving Lives Through Education

  8. #6
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    A clone of me? That would mean two ladykillers.
    Last edited by pzgr40; 8th March 2010 at 04:50 PM.
    Looking for / Suche noch:
    -8,8cm Pzgr.40.
    -8,8cm D (drahtsperre)

  9. #7
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    Hint: They will always die when you section them!
    ___HAZ/
    _____/ORD Hazardous Ordnance Recognition
    ________Saving Lives Through Education

  10. #8
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    Ahhhh, that's why they become so silent. Thanks for the tip
    Rgards DJH
    Looking for / Suche noch:
    -8,8cm Pzgr.40.
    -8,8cm D (drahtsperre)

  11. #9
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    Again a great cutaway, thanks for showing.
    Any Live or Dug ordnance shown by me has been disposed of by military EOD personnel .

  12. #10
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    Clone DJ!!!! That will be a big problem here for the Army they will have no stuff left he will cut up everything

    Nice work again DJ
    Regards Madbomber

    All Items of Live Ordnance posted by me have been disposed of by EOD.

 

 
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