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| U.S.N.B.D. - BRITISH BOMBS AND FUZES; PYROTECHNICS; DETONATORS |
| ANTI-SUBMARINE BOMBS |
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BRITISH BOMB |
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FUZING: |
500 LB. A.S. |
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Mks I - III: Nose Fuze No. 32 |
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Mk IV: Tail Pistol No. 28 or No. 30. |
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COLOR & MARKINGS: |
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Dark green overall, ½" red band 1" from nose, |
Mks I - IV |
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1" light green band 6" from nose. Earlier designs |
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originally yellow overall. |
(Obsolescent) |
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TAIL NO. |
Mk IV: No. 9 Mk I |
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OVERALL LENGTH |
74.0" (Mks I & II) |
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76.0" (Mk III) |
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72.5" (Mk IV) | |
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BODY LENGTH |
53" (Mks I, II & III) | |
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50" (Mk IV) | |
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MAX. BODY DIAMETER |
14.0" (Mks I & II) | |
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14.3" (Mks III & IV) | |
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WALL THICKNESS |
0.16" (Mks I & II) | |
| 0.18" (Mk III & IV) | ||
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TAIL LENGTH |
24.2" (Mk IV) | |
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TAIL WIDTH |
14" (Mk IV) | |
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TOTAL WEIGHT |
490 lbs. (Mk IV) | |
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CHARGE/WEIGHT RATIO |
62 - 64% (Mk III) | |
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58% (Mk IV) |
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BODY CONSTRUCTION: |
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Mk IV – Hollow nose forging or casting and cast of forged tail adapter welded to sheet steel casing. Nose threaded to take solid nose plug locked by a locking screw. Casing made in two parts, welded together longitudinally. Tail adapter receives exploder container, which is locked and sealed in position, housing detonator holder and pistol. |
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Mk I - III – Nose of bomb fitted with adapter for nose fuze. Internal strengthening bands welded to body. No tail adapter. Bal-listic cap screws on the nose to prevent ricochet. |
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TAIL CONSTRUCTION: |
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No. 9 Mk I: Sheet metal cone with cylindrical strut attached by four fins, secured to tail adapter by four spring clips on the cone. Reach rod, with arming vanes attached to after end, extends through the cone and engages arming fork of tail pistol. |
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Mks I - III – Cylindrical strut attached by four fins to a dome shaped tail cone, se-cured to the bomb by a central bolt. |
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SUSPENSION: |
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Horizontal suspension by single lug, secured by screws projecting through the case and into a steel block support pad welded to interior of body. |
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EXPLOSIVE COMPONENTS: |
Detonators: |
(See Appendix I, page 309) |
| Exploders: |
C.E. pellets (earlier bombs had C.E. and T.N.T.) |
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| Filling: |
Mk IV: 282 lbs. T.N.T. (may be filled with R.D.X./ T.N.T. When R.D.X./T.N.T. is used, bomb has ½" nose topping and 1" base topping of T.N.T.) |
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Mk III: 291 lbs. T.N.T. or 308 lbs. Baratol 10/90 |
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REMARKS: |
(1) |
These bombs are designed to give maximum blast effect for use against submarines. |
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(2) |
No. 30 Tail Pistol with needle striker to be used in Mk IV for A/S bombing; No. 28 can be used in place of No. 30 for land bombardement. |
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