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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: |
250 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, II, III (Obsolescent) |
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1" light green band 4½" from nose. Earlier models |
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originally yellow overall. |
Mk IV (Service) |
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TAIL NO. |
Mk IV - No. 8 Mk I |
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OVERALL LENGTH |
Mk III - 59" |
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Mk IV - 58" |
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BODY LENGTH |
Mk III - 42" | |
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Mk IV - 35.2" | |
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MAX. BODY DIAMETER |
11.35" (Mk IV) | |
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11.2" (Mk III) | |
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WALL THICKNESS |
0.14" (Mks III & IV) | |
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0.125" (Mks I & II) | |
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TAIL LENGTH |
23.4" | |
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TAIL WIDTH |
11.0" | |
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TOTAL WEIGHT |
243 lbs. (Mk IV) | |
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CHARGE/WEIGHT RATIO |
55% (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. Hollow flat 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, hous-ing detonator holder and pistol. |
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Mk I - III – Nose of bomb fitted with adapter for nose fuze. In-ternal 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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Mk IV – Sheet steel cone with cylindrical strut attached by four fins secured to the 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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Mk I - III – Cylindrical strut attached by four fins to a dome shaped tail cone, secu-red 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 in-terior of body. |
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EXPLOSIVE COMPONENTS: |
Detonators: |
(See Appendix I, page 309) |
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Exploders: |
C.E. pellets (Early marks had C.E. and T.N.T.) |
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Filling: |
Mk IV – 134 lbs. R.D.X./T.N.T. or 132 lbs. T.N.T. When R.D.X./T.N.T. is used, bomb has ½" nose top-ping and 1" base topping of T.N.T. |
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Mk III – 149 lbs. Baratol or 140 lbs. T.N.T. |
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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 Mk IV for A/S bombing; No. 28 can be used in place of No. 30 for land bombing. |
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