Welcome to the Inert Ordnance Collectors.
Results 1 to 4 of 4
  1. #1
    Senior Member
    Join Date
    Jun 2007
    Location
    INNISFAIL, TROPICAL NORTH QUEENSLAND, AUSTRALIA
    Posts
    598
    Images
    155
    Thanks
    100
    Thanked 553 Times in 139 Posts

    JAPANESE NAVY BOMB FUZE A-3(a)

    Hi everyone,
    Here is one of my latest additions to my collection. It is a Japanese Navy Air Force A-3(a) mechanical impact bomb nose fuze.


    NAVY TYPE 97, Mk II, IMPACT FUZE, MODEL 2

    KEY FOR ILLUSTRATION:
    1 ARMING VANE
    2 SCREW
    3 LARGE HEADED SCREW
    4 BRASS CAP
    5 ARMING WIRE
    6 PRESSURE SLEEVE
    7 WASHER
    8 SHEAR WIRE
    9 TRANSIT SAFETY FORK
    10 STRIKER SPINDLE
    11 FUZE BODY
    12 STRIKER NEEDLE
    13 SET SCREW
    14 BRASS LOOP
    15 INTERNAL THREAD

    US DESIGNATION
    Japanese bomb fuze - A.3(A)

    TYPE
    NAVY Air force mechanical impact nose fuze to which a Navy type standard gaine or magazine can be fitted.

    BOMBS IN WHICH USED
    a) Incorporating a gaine ‑
    60 Kg, Type 97. GP - Navy type
    60 Kg, Type 98, GP - " "
    63 Kg, Type 99, SAP- " "
    250 Kg, Type , GP - " "
    250 Kg, Type , SAP- " "

    b) Incorporating a magazine ‑
    60 Kg, Type 97, Incendiary (electron fire-pots)
    60 Kg, Type 98, " (solid oil)
    250 Kg, Type, " (electron/steel Cylinders)

    COLOUR
    Natural BRASS.

    DESCRIPTION (See diagram)
    The fuze body (11) houses the striker mechanism only. A striker spindle (10) passing through the centre of the body is left-hand threaded at the upper end to take a pressure sleeve (6). The spindle is prevented from rotating by a set screw (13) and a safety shear wire (8). A large-headed screw (3) threaded right-hand screws into the top of the spindle to prevent the pressure sleeve unscrewing com­pletely from the spindle.
    Four screws (2) pass through the centre flat of the 4-bladed arming vanes (1) and the top of the brass cap (4) and screw into the pressure sleeve (6), thus the whole assembly (1), (4) and (6) is free to rotate.
    A steel striker needle (12) screws into the lower end of the spindle. The lower end of the fuze body is threaded (15) to take a Navy type standard gaine or magazine.
    A 3-pronged transit safety fork (9) prevents ro­tation of the vanes. This is withdrawn on loading into the bomb rack.
    An arming wire (5) is soldered at one end to the side of the brass cap (4), taken 13/4 turns around the brass cap, then passed through the brass loop (14) ending in a loop

    ACTION
    On release, the arming wire (5) gives the vanes their initial start overcoming any binding between the brass cap and fuse body. The vanes rotate clockwise and the as­sembly (1), (4) and (6) is raised outward until the pressure sleeve is stopped by the large screw (3).

    On impact, the brass cap and pressure sleeve assembly forces the spindle inwards shearing the safety wire, and the initiator is pierced by the striker needle.

    DISPOSAL
    a) Destruction. When the bomb is to be destroyed in situ, the fuze should be blown up with the bomb

    b) Rendering safe for handling. Secure the brass cap (and therefore the spindle) against movement in any direction with adhesive tape and pliable wire. If Special BD Tool No 1 is used, apply so as to grip both the Cap and fuze body or, if pos­sible, the fuze body immediately below the cap.

    c) Fuze removal.
    i. Perform (b)above
    ii. Remove grub screw securing fuze to the bomb
    iii. Unscrew fuze by means of the remote con­trolled Fuze Extractor Design III (Aust.) if available.

    Alternatively, unscrew fuze only a partial turn with Special BD Tool No 5 (spanner) or Stillson Wrench and complete removal by re­mote control.


    Cheers,
    BOUGAINVILLE
    Attached Images Attached Images
    Last edited by BOUGAINVILLE; 25th April 2010 at 03:45 PM.

  2. #2
    Senior Member
    Join Date
    Jan 2009
    Location
    USA
    Posts
    166
    Images
    3
    Thanks
    16
    Thanked 33 Times in 21 Posts

    nice

    Nice fuze in the can! There is a similar fuze on gunbroker that has the red warning tag still attached minus the shipping can. It's been listed for months now, maybe the seller might take an offer......


    Naval fuzes are so much nicer than army fuzes.
    Jim

    JapaneseOrdnance(at)yahoo.com

  3. #3
    Senior Member
    Join Date
    Jun 2007
    Location
    INNISFAIL, TROPICAL NORTH QUEENSLAND, AUSTRALIA
    Posts
    598
    Images
    155
    Thanks
    100
    Thanked 553 Times in 139 Posts
    Thanks for the tip off JCB99. His price is a wee bit expensive, that is why it hasn't sold. Besides the shipping can, the arming wire is also missing.
    I'm tempted to find out how low he will go just so that I can get hold of the tag.

    Cheers,
    BOUGAINVILLE


    Quote Originally Posted by JCB99 View Post
    Nice fuze in the can! There is a similar fuze on gunbroker that has the red warning tag still attached minus the shipping can. It's been listed for months now, maybe the seller might take an offer......


    Naval fuzes are so much nicer than army fuzes.
    Jim

    JapaneseOrdnance(at)yahoo.com

  4. #4
    Senior Member
    Join Date
    Apr 2009
    Location
    Illinois U.S.
    Posts
    4,029
    Images
    65
    Thanks
    103
    Thanked 91 Times in 62 Posts

    Karanza

    Beautiful fuze my man. Looks count a great deal in my decisions and this one is a beauty. Thanks for sharing...Dano

 

 

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Back to top