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| U.S.N.B.D. - BRITISH BOMBS AND FUZES; PYROTECHNICS; DETONATORS |
| MEDIUM CAPACITY BOMBS |
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BRITISH BOMB |
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FUZING: |
500 LB. M.C. |
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Nose Pistol No. 27, 42, or 44. |
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Tail Pistol No. 28, 30, or 37. |
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COLOR & MARKINGS |
Dark green overall; ½" red | |
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band around nose, 1" light |
Mks I - V: Obsolescent |
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green band around base of |
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ogive |
Mks VI - XII: Service |
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TAIL NO. |
No. 2 Mk I; No. 25 Mks I |
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or II; No. 26 Mk I, or |
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No. 28 Mk I. |
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OVERALL LENGTH |
70.6" (with long tail) | |
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57.8" (with short tail) | |
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BODY LENGTH |
41" | |
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MAX. BODY DIAMETER |
12.9" | |
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WALL THICKNESS |
0.3" (Mks I, II, VI, VII) | |
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0.42" (Mks III, IV, V, VIII - XII) | |
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TAIL LENGTH |
No. 25 Mks I, II: 28" | |
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No. 28 Mks I, II: 14" | |
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TAIL WIDTH |
12.9" | |
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TOTAL WEIGHT |
Mk VIII with short tail: 499 lb. Amatol 60/40 | |
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511 lb. R.D.X./T.N.T. 60/40 |
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521 lb. Tropex 2 |
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CHARGE/WEIGHT RATIO |
50% (approx.) |
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BODY CONSTRUCTION: |
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Parallel sides with ogival nose end slight rear taper, similar in construction to U.S. General Purpose bombs. With exceptions as given below, exploder container screw into nose and base plate. Mk I: fabricated; rolled steel sheet, welded with nose and tail welded on. Mk II: drawn tube, nose formed by "bootling proceses, tail welded on. Mk III: cast. Mk IV: cast to 500 lb. G.P. dimensions. Mk V: same as Mk III, but center of gravity was off all de-clared obsolescent immediately; used only with long tail unit. Mks VI, VII, VIII, and IX are same as Mks I, II, III, IV respectively with American duel sus-pension luge added. Mk X: forged body, solid nose, fuzed only in tail. Mk XI: Mk VII with solid nose. Mk XII: Mk VII with improved weld at after end and fuzed both nose and tail. |
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TAIL CONSTRUCTION: |
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No. 25 and No. 28 tails are similar in construction each consisting of a cylindrical strut attached to a tail cone by four fins. Secured to body by four spring clips engaging slots in the tail end of the body. Turnbuckle fittings are provided to two of the springs as a locking device. A reach rod through the tail cone engages the arming fork of the pistol and carries arming vanes at the rear. Arming vanes protrude beyond the cylindri-cal strut and fins on the short-type No. 28 tail unit. |
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SUSPENSION: |
Mk I – V | Single suspension lug welded to body. |
| Mk VI – XII |
Dual lugs for suspension from U.S. aircraft welded on in addition to single lug. |
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EXPLOSIVE COMPONENTS: |
Detonators: | (See Appendix I, page 309) |
| Exploders: | C.E. pellets | |
| Filling (Mk VIII): |
210 lb. Amatol 50/50 or 60/40 225 lb. Amatex 51/40/9 222 lb. R.D.X./T.N.T. 60/40 232 lb. Torpex 2. |
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REMARKS: |
(1) |
These bombs supplied with No. 28 or No. 30 tail pistol, and may or may not be fuzed at the nose. |
| (2) |
The short type tail unit, such as the No. 28, Mk I, is used when the bombs are dropped from fighter-bombers aircraft. |
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| (3) |
Anti-disturbance fuze No. 845, formaly incorporated in the nose of bombs fuzed with the No. 37 tail pistol, is now obsolete. |
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(4) |
Tail fins usually painted red when time pistole is used. |
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