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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: |
500 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 below. |
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. |
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TAIL NO. |
No. 2 Mk I or No. 26 Mk I |
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or II. | |
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OVERALL LENGTH |
With No. 2 Tail: 70.6" | |
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With No. 26 Tail: 55.6" | |
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BODY LENGTH |
Mk IV - 37.2" |
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Mk V - 36.4" | |
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MAX. BODY DIAMETER |
12.9" | |
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WALL THICKNESS |
0.72" |
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TAIL LENGTH |
No. 2 Mk I - 33.4" | |
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No. 26 Mk I - 20.4" | |
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TAIL WIDTH |
12.9" |
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TOTAL WEIGHT |
470 lb. (with long tail) | |
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CHARGE/WEIGHT RATIO |
31% (Approx.) |
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BODY CONSTRUCTION: |
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Mk IV – Hollow steel casting, open at each end. Nose end inter-nally threaded to house an exploder container, which is locked in position by a locking screw. The tail end is shaped to take the tail cone and is provided with four equally spaced slots which lo-cate the spring clips on the tail. A filling plug (male base plug) threads into the tail end of the body, having two holes threaded to receive the transit base bolts. |
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Mk V – This bomb is externally the same as the Mk IV, but has a central exploder tube instead of the exploder pockets at sither end. The fuzing is in the tail only, and the nose is closed with a bung which has a cross cut in the end, not a ring as in the Mk IV bombs. |
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TAIL CONSTRUCTION: |
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500 lb. No. 2 Mk I – This tail differs from the 250 lb. No. 2 Mk I tails only in the weight and dimensions. Sheet metal tail attached to body by four spring clips. Tail con-sists of a tail cone with a cy-lindrical tail strut attached to it by four fins. |
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500 lb. No. 26 Mk I – This tail assembly is similar to the 500 lb. No. 2 Mk I tail, differ-ing mainly in weight and dimensions. It is used on the Mk IV or Mk V 500 lb. G.P. bombs when carried ex-ternally on high speed fighter aircraft or internally on fighter bombers of the Mosquito type. The tail fins are shorter, and it has a two-bladed arming vane in-stead of the 4-bladed arming vane used on the No. 2 Mk I tail. |
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SUSPENSION: |
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Suspended by a single lug slightly aft to center of gravity, secured by four counter-sunk screws to the bomb body. |
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EXPLOSIVE COMPONENTS: |
Detonators: |
(See Appendix I, page 309) |
| Exploders: |
Mk IV – T.N.T. and C.E. |
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Mk V – Has one central exploder tube instead of the nose end tail exploder containers. The exploder consists of C.E. pellets & T.N.T. |
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| Filling: |
144.5 lb. of T.N.T. or 143 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 are too long to fit into the Mk IV bomb. |
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(2) The No. 845 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 manufactur-ed there to British designs: Nose Fuze Mk VII, M3; Tail Fuze Mk V, M1. |
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