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  1. #1
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    30x173 ammo for Goalkeeper / GAU-8/A

    Cutaway models of several 30x 173 cartridges as used in the Gau -8A Anvenger gatling gun, the Goalkeeper CIWS, and the 30 mm Mk 44 Bushmaster gun.

    The Gau-8 has a firing rate of 3.900 rpm. The standard ammunition mixture for anti-armor use is a four-to-one mix of PGU-14/B Armor-Piercing Incendiary (API), with a projectile weight of about 15.0 oz (425 grams or 6,560 grains) and PGU-13/B High Explosive Incendiary (HEI) rounds, with a projectile weight of about 12.7 oz (360 grams). The PGU-14/B round incorporates a depleted uranium penetrator. The Avenger is lethal against tanks and any other armored vehicles.
    A very important innovation in the design of the GAU-8/A shells is the use of aluminum alloy cases in place of the traditional steel or brass. This alone adds 30% to ammunition capacity for a given weight. The shells also have plastic driving bands that tripple barrel life.

    Films showing the Gau-8 in action:
    [ame="http://www.youtube.com/watch?v=QiCWrL6VjsY&feature=related"]http://www.youtube.com/watch?v=QiCWrL6VjsY&feature=related[/ame]
    (notice that one fires PGU 13/b HE shells (Yellow)
    [ame="http://www.youtube.com/watch?v=F6itQfUwF1o&feature=related"]http://www.youtube.com/watch?v=F6itQfUwF1o&feature=related[/ame]

    The Goalkeeper is a Dutch design CIWS (Close In Weapon System) designed by Holland signaal. It is an autonomous functioning system consisting of a GAU-8/A Avanger gatling gun (4200 rpm in 200 rnds bursts), a Search and a track radar and a computer. The system can track up to 18 targets and descide which has priority in destruction. Several goalkeepers on one ship can function apart or as a “team”.
    Films showing the Goalkeeper in action:

    [ame="http://www.youtube.com/watch?v=eZBFSGzRyV4"]http://www.youtube.com/watch?v=eZBFSGzRyV4[/ame]

    [ame="http://www.youtube.com/watch?v=zdeNI328pjk&feature=related"]http://www.youtube.com/watch?v=zdeNI328pjk&feature=related[/ame]

    The Bushmaster Mk44 as used in the USMC's Expeditionary Fighting Vehicle (EFV):

    [ame="http://www.youtube.com/watch?v=hvHK-HooR78&feature=related"]http://www.youtube.com/watch?v=hvHK-HooR78&feature=related[/ame]


    The ammunition for the guns:

    1- The PGU (Projectile Gun Unit) 16/b dummy. The projectile has been connected to the shellcase by means of an allan screw which is placed in the primer pocket. Length of round 290 mm.

    2- The PGU-15/b Target Practice (TP). In shape it mainly resembles the PGU-13/b

    3/4- The PGU-13/b High Explosive Incendiary (HEI) cartridge.
    Round length: 290 mm
    Round weight: 662 grams
    Projectile weight: 360 grams
    Muzzle velocity: 1021 mtrs/sec

    The projectile No.3 has a double drivingband and is manufactured by Aerojet Ordnance Company, projectile No.4 with the single red drivingband has been manufactured by ATK.

    The projectile is fuzed with the M505 nose impact fuze.
    The M505 nose impact fuze is made of seven parts:
    -the steel fuze housing
    -the detonator ball
    -the U shaped red copper clamp (around the det. ball)
    -the booster cap
    -the collared firing pin
    -the ballistic nose tip.

    The detonator Ball has a channel, containing the detonator. In rest this channel is out of line with the firing pin so the firing pin cannot reach the detonator. A U shaped red copper calmp fixates the ball in this position.
    On firing, the U shaped clamp is forced open by the centrifugal force, releasing the ball. The centrifugal force will now start to throw the heaviest part of the ball outward, thereby turning the detonator channel in line with the centerline of the projectile.
    On impact, the ballistic cap is hammered inward, pushing the firing pin down (ripping it of the collar) into the detonator. This will set of the detonator, the booster (white) and the main charge.

    5- The PGU-15/b Target Practice (TP)
    Round length: 290 mm
    Round weight: 667 grams
    Projectile weight: 365 grams
    Muzzle velocity: 1018 mtrs/sec

    6- The PGU-14/b Armour Piercing Incendiary (API). This is the round housing the infamous Deplated Uranium (DU) penetrator.
    Penetration of the projectile : 69 mm at 500 mtrs, 38 mm at 1000 mtrs
    Round length: 290 mm
    Round weight: 727 grams
    Projectile weight: 425 grams
    Muzzle velocity: 983 mtrs/sec

    ** This cutaway model has a mild steel fake core, it contains NO!! deplated uranium**

    7- The APDS (armour Piercing Discarding Sabot) projectile. After leaving the barrel the white sabots are ripped off, only the core continues. The type with the white sabot is the older type and not currently in use

    8- The MPDS (Missile Piercing Discarding Sabot). The later type of cartridge as in use now with the dutch navy. After piercing the target, the core braks into a cloud of smaller pieces that act as shrapnell. This in contrast to the APDS projectile that mainly remains in one piece.

    Regards , DJH
    Attached Images Attached Images
    Last edited by pzgr40; 20th October 2008 at 12:14 AM.

  2. #2
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    very nice cutaways

  3. #3
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    Thanks, there's more to follow
    Regards DJH
    Last edited by pzgr40; 20th October 2008 at 12:13 AM.

  4. #4
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    I received some more info today about catridge No.8
    Catridge No.8 is called FMPDS when in use with the Brittish navy between 1994 and 1998, however called MPDS when used with the dutch navy.
    The official Dutch designation is: "Cartridge 30mm MPDS, MN30" (MN= Model Nederland 30)
    The cartridge is currently being produced by Rheinmetall Waffen & Munition Schweiz AG ,the former Oerlikon Contraves AG.
    Regards DJH

  5. #5
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    Thumbs up

    an excellent thread, thank you!

  6. #6
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    Glad you like it, I hope it contains all the info you were looking for.
    Regards, Derk H.

  7. #7
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    A very interesting experimental cartridge I was asked to repair/improve/patch up for a fellow collector – so regretably not mine- ; a GAU-8 30x173mm RAP-AP (Rocket Assisted Projectile-Armour Piercing)cartridge.

    There were two competing designs, intended to improve short-range
    penetration and achieve a longer effective range. One, by Thiokol (c.
    1973), had the penetrator in the nose and the rocket behind, but this
    was not considered successful. The successful one was by AAI (c.1976)
    and this retained a central penetrator (longer than standard) running
    almost the whole length of the projectile, with the rocket material
    wrapped around it.

    The AAI RAP has the penetrator supported in a monocoque steel shell.
    The rocket is an "end-burner" vented through four nozzles in the base.
    The windscreen (ballistic cap) is plastic."

    The owner of the cartridge had received the following info:

    “The only mention of the GAU-8 RAP I have come across is in Dale
    Davis' excellent 1984 publication "Historical Development Summary of
    Automatic Cannon Calibre Ammunition: 20-30 Millimeter", published by
    the US Air Force Armament Laboratory, where Davis worked.
    There is a photo of the sectioned projectiles in
    the book but sadly I only have a poor-quality photocopy so very little
    detail can been seen. However, it is clear that the example in your
    photo is the AAI RAP”.

    Regards, DJH

    Attached Images Attached Images

  8. #8
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    So that everyone can see the restoration skills Derk has, here's a BEFORE shot of the RAP round.
    Attached Images Attached Images

  9. #9
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    Great thread pzgr40, fantastic work you have done there.
    Dave.

  10. #10
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    @ Slick, thanks. However a pitty I did not find this cartridge for myself, it would have been a great addition to my collection. Seeing the pictures I suppose it came from you?
    @ SG500, you're welcome.

    On the WK2 ammo forum one of the members (LV) posted a link to the davis report:
    http://mildepot.files.wordpress.com/...istoryguns.pdf

    Regards, DJH

 

 
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