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| U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS |
| SECTION I - HIGH EXPLOSIVE BOMBS |
| PART IV - U.S. ARMY-NAVY "AN" SERIES BOMBS |
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DATA: |
U.S. ARMY BOMB |
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M 83 |
4 LB. FRAG |
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OVERALL LENGTH |
3.0 in. | ||
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BODY LENGTH |
3.0 in. | ||
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BODY DIAMETER |
3.1 in. | ||
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WALL THICKNESS |
0.25 in. |
M 83 |
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TAIL LENGHT |
(Service) |
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TAIL WIDTH |
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TAIL WEIGHT |
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WEIGHTS: |
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Type of Filling |
T.N.T. | ||
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Weight of Filling |
.47 lbs. | ||
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Total Weight |
3.2 lbs. | ||
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Chg/Wt. Ratio |
15% |
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FUZING: |
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M 129 (Air or ground burst) |
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M 130 (Time maximum 30 min.) |
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M131 (Anti-disturbance) |
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BODY CONSTRUCTION: |
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The bomb body is cylindrical in shape, cast in two halves and welded together. The fuze cavity is situated athwarships in the body, is 1-3/4 inches in diameter, and is threaded with a left-hand thread. The left-hand thread is to prevent un-screwing of the fuze while the bomb is in flight. |
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ARMING VANE ASSEMBLY: |
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The vane assembly consists of four pieces hinged together - two semi-cylindrical surfaces (wings) and two discs (propeller blades) inclined at a slight angle. While the bomb is still in the cluster the vane assembly is folded around the bomb to form a cylindrical casting which can be closed against the pressure of the vane coil springs by means of a safety clip. The arming spindle projects through the bomb casting. |
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When the bomb are packed in the cluster adapter the safety clips are removed but the bombs remain in their closed status due to their proximity to each other. When the cluster adapter bursts open the bomb scatter and the vane assembly on each bomb is spread open by the force of its coil springs. The vane assembly is for-ced to the top of the arming spindle by air resistance, where the square head on the spindle engages the square hole in the assembly. The two "wings" reduce the velocity of descent of the bomb. The two "propellers", being set at angles to each other, cause the vane assembly to turn in a counter-clockwise direction, thereby screwing the arming spindle out of the fuze body and permitting the fuze to arm. The arming spindle is not completely withdrawn from the fuze, being retained in the fuze by a collar on the spindle. |
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COLOR AND MARKINGS: |
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The bomb are painted olive drab with a .5 in. yellow band running horizontally around the folded "wings". |
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