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| BRITISH EXPLOSIVE ORDNANCE |
| Part 1 - Chapter 8 |
| Antisubmarine Bombs |
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A.S. 100-lb. Mks I - IV (Obsolescent), and Mk VI (Service) |
| Data |
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Fuzing |
Mks I - III, Nose Fuze No. 32; Mk IV, Tail Pistol No. 28 or No. 30; Mk VI, Tail Pistol No. 30, or Tail Fuzes No. 875 or No. 895 |
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Color markings |
Dark green over-all; ½-in. red band 1 in. from nose; 1-in. light green band 4 in. from nose |
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Tail No. |
Mk IV, No. 7 Mk I; Mk VI, No. 56 Mk I |
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Over-all length |
42 in. (Mk VI is several inches longer with nose attachment) |
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Body length |
Mks I - III, 31 in. |
| Mks IV - VI, 24.08 in. | |
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Body diameter |
8.05 in. |
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Wall thickness |
0.11 in. |
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Tail length |
18 in. |
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Tail width |
8 in. |
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Total weight |
98 lb. |
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Charge/weight ratio |
45% (approx.) |
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Body Construction: The Mk IV body consists of a hollow nose forging of casting, and a cast or forged tail adapter, welded to a sheet steel casting. The hollow nose is threa-ded to tak a solid, flat nose plug, which is secured by a locking screw. The casing is made of two parts, welded together longitudinally. The tail adapter receives the exploder container, which is locked and sealed in position, and houses the detonator holder and pistol. |
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The Mk III body has a nose fitted with a nose fuze adapter, three internal strengthe-ning rings, and a tail adapter. A ballistic cap screws onto the nose to prevent ricochet. |
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The Mk IV body, the nose plug and a cup shaped nose attachment are welded on. |
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Tail Construction: The Bomb Mk IV uses a Tail Assembly No. 7 Mk I which consists of a sheet-metal tail cone with a cylindrical strut attached by four fins. It is secured to the tail adapter by four spring clips on the cone. The tail assembly als has a reach rod, with arming vanes on after end, which extends through the tail cone to engage the arming fork of the tail pistol. |
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The tail of the Bomb Mk III consists of a cylindrical strut, attached by fins to a dome, which is secured to the bomb by a central bolt. |
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The Bomb Mk VI uses a Tail No. 56 Mk I, which is secured by four locking screws threaded through four cone-securing bosses welded on at an angle to tail cone. The screws thread inward and aft to engage slots in the bomb body. |
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Suspension: The bomb is horizontally suspended by a single lug, which is secured by screws projecting through the case and into a steel-block support pad welded to the in-terior of the body. |
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Explosive Components |
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Detonator – (See Part 2, chap. 4, Detonators.) |
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Exploders – C.E. |
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Filling – Mk IV, 45 lb. RDX/TNT 60/40 or 44 lb. TNT; Mk VI, 49 lb. Torpex (When filled with Torpex, a topping of TNT is added at the nose and base.) |
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Remarks: The Tail Pistol No. 30 with needle striker is to be used in the Bomb Mk IV for A/S bombing. The Pistol No. 28 can be used in place of the No. 30 for land bombard-ment. |
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The Bomb Mk V was never produced. |
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Figure 29 – A.S. 100-lb. Bomb Mk IV |
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Figure 30 – Nose of A.S. 100-lb. Bomb Mk VI |
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