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| U.S.N.B.D. - BRITISH BOMBS AND FUZES; PYROTECHNICS; DETONATORS |
| GENERAL PURPOSE BOMBS |
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BRITISH BOMB |
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FUZING: |
250 LB. G.P. |
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Mk IV - Nose Pistol No. 27, 42, or 44. |
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Tail Pistol No. 28, 30, or 37. |
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Mk V - Tail Pistol No. 17 (Long Delay) only. |
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Mk VI - (See Remarks) |
Mks IV, V, VI |
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COLOR & MARKINGS |
Dark green overall; ½" red |
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band 1" from nose; 1" light green band 6" from |
(Service) |
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nose. 1" x ¼" white line on the body base indi- |
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cates that bomb has been filled. |
(MK VI - See Remarks) |
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TAIL NO. |
No. 2 Mk II (early Mk IV |
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has No. 2 Mk I). | |
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OVERALL LENGTH |
56.00" | |
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BODY LENGTH |
Mk IV: 25.60" | |
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Mk V: 27.6" |
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MAX. BODY DIAMETER |
10.2" | |
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WALL THICKNESS |
0.52" | |
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TAIL LENGTH |
27.7" |
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TAIL WIDTH |
10.2" | |
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TOTAL WEIGHT |
230 lb. | |
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CHARGE/WEIGTH RATIO |
29% |
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BODY CONSTRUCTION: |
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Mk IV – Hollow steel casting open at each end. Nose end internally threaded to house exploder container which is locked in position by a locking screw. Tail end shaped to take the tail cone, provided with four equally spaced supports which locate the spring clips on the tail. A filling plug (male base plate) threads into the tail end of the body having two holes threaded to receive transit base plate. |
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Mk V – The Mk V is the same externally as the Mk IV but is fitted with a central ex-ploder tube instead of the exploder container at the nose and tail. Thise bomb does not take a nose pistol, using only the No. 17 long delay pistol. The nose opening is filled with a nose plug with a cross cut. |
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TAIL CONSTRUCTION: |
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No. 2 Mk I – Sheet metal tail attached to body by four spring clips. Tail consists of a tail cone with a cylindrical tail strut attached to it by four fins. The spring clips are fit-ted to the base of the cone, which is slotted to engage with the locating pin and the bomb body. At the apex of the tail cone is fitted a bush, which locates one end of arm-ing spindle, supported at the opposite end by a diaphragn at the base of the tail cone. The rear end of the arming spindle has attached to it an arming fork which engages with the arming fork of the No. 28 or either tail pistol of the bomb. |
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SUSPENSION: |
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Suspended by a single suspension lug, secured by four countersunk screws to the bomb body. |
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EXPLOSIVE COMPONENTS: |
Detonators: | (See Appendix I, page 309) |
| Exploders: | T.N.T. and C.E. | |
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Filling: |
67.75 lbs. T.N.T. or 67 lb. Amatol 60/40. |
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(1) Mk. V bomb was manufactured to use up existing stocks of the No. 17 (long delay) pistol, which is too long to fit in the Mk IV bomb. |
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(2) The No. 843 anti-disturbance fuze, formerly incorporated in the nose when the tail pistol No. 37 was used, is now obsolete. |
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(3) Tail fuze usually painted red when time pistol is used. |
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(4) The Mk VI bomb is made in the U.S. and uses fuzes manufac-tured there to British designs. Nose Fuze Mk VII, M3; Tail Fuze Mk V, M1. |
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