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| U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS |
| SECTION III - BOMB FUZES |
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DATA: |
U.S. ARMY TAIL FUZES |
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M132, M133, M134 |
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BOMBS USED IN |
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M132 |
AN-M30A1 100# G.P. | |
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AN-M57A1 250# G.P. | |
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M133 |
AN-M64A1 500# G.P. |
(SERVICE) |
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AN-M58A2 500# S.A.P. |
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M134 |
AN-M65A1 1000# G.P. |
CHEMICAL TIME |
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AN-M66A1 2000# G.P. |
ANTI-WITHDRAWAL |
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AN-M59A1 1000# S.A.P. |
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M103 2000# S.A.P. |
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FUNCTIONING |
10 minutes average che- |
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| mical delay with range of | ||
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6 - 80 minutes delay possible due to temperature variations. | |
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ARMED CONDITION |
No external indication, assumed to be armed if dropped. | |
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FUZES USED WITH |
None | |
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ARMING TIME |
63 vanes revolutions (min.) | |
| 84 vanes revolutions (max.) | ||
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VANE SPAN |
5 in. | |
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MAX. BODY DIAMETER |
1.5 in. | |
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OVERALL LENGTH |
M132 - 9.57 in. | |
| M133 - 12.57 in. | ||
| M134 - 16.57 in. | ||
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MATERIAL |
Cadmium, zinc plated or cromak treated zinc plated steel. |
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GENERAL: |
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The only difference in these three fuzes is in the length of the arming stem. Larger bombs require longer arming stem so that the vanes can catch the air slip from the bomb. These fuzes are dependent upon chemical action for normal functioning, and atmospheric temperatures will have a direct bearing on the length of the delay. The fuzes are similar in principle to the M123 series, but are safer in that the solvent is con-tained in a flexible copper bellows rather than a glass ampoule. The fuze body does not project far beyond the adpater booster; hence, there is less chance of breakages upon severs multiple impacts. THIS FUZE, AS IS THE M123 SERIES, HAS A BALL LOCKING DEVICE AND ANY ATTEMPT TO REMOVE THE FUZE WILL RESULT IN DETONATION OF THE BOMB. |
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OPERATION: |
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When the bomb is dropped, the arming wire is withdrawn, and the vanes rotate. The vane assembly is the same as in the M123 series, and the vanes act through reduction gears like those in the AN-M100A2 series fuzes, to turn the arming stem, which is threaded to the plunger carrying the knife edge. As the arming stem turns, the plunger the knife edge threads down, compressing the sylphon bellows and piecring the gliding metal sealing cup. The T-slot channel is the knife edge allows the acetone to drain out of the bellows and act on the celluloid tubing delay element. The three felt washer and the glass wool absorb excess acetone and concentrate it on the delay element. As the delay element is dissolved after a minimum of five minutes, the compressed firing pin spring thrusts the aluminum ball retainer upwards, freeing the extension balls holding the firing pin in place. The firing pin spring then forces the firing pin down onto the M19A2 detonator. |
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If an attempt is made to withdrawn the fuze once it has been installed, the anti-withdrawal locking ball will ride into the shallow part of its groove and lock the lower part of the fuze body to the adapter booster. Further turning of the fuze will unthread the upper part of the fuze and permit the ball retainer to be forced up by the cocked firing pin spring, allowing the balls to be forward out and the firing pin to strike the M19A2 primer detonator. |
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REMARKS: |
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The concentration of acetone is not varied in these fuzes as in the M123 series, nor are additional celluloid pluge added to prolong the delay. Variable delays result only from temperature variations, as is indicated in the following table: |
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Temperature |
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Length of delay |
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122° F |
6 min. |
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110° F |
7.5 min. |
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85° F |
15 min. |
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70° F |
21 min. |
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55° F |
30 min. |
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40° F |
40 min. |
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32° F |
45 min. |
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10° F |
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80 min. |
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