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| U.S. EXPLOSIVE ORDNANCE |
| PART 6 - BOMBS AND BOMB FUZES |
| Chapter 20 - BOMB FUZES |
| Section 2 - ARMY-DESIGNED BOMB FUZES |
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M151 (Tail Mechanical Impact) |
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Bombs |
100-lb. AN-M30A1 and 250-lb. G.P. AN-M57A1 equipped with Anti-Ricochet Parachute M7 and Fuze Adapter M202; 500-lb. G.P. AN-M64A1, equipped with Anti-Ricochet Pa-rachute M6 and Fuze Adapter M200 |
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Functioning |
4 to 5 or 8 to 15 seconds delay |
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Armed condition |
Consider armed if arming stem extends 1 5/15 inches from fuze body (vane shaft side); or after approximately 12 vane revolutions |
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Vane span, inches |
5 |
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Body diameter, inches |
1.5 |
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Over-all length, inches |
5.5 |
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Material |
Cadmium-plated steel |
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General: The Tail Mechanical Impact Fuze M151 consists of a modified M112A1 series fuze body. The body has been lengthened to accommodate a plunger stem which is at-tached to the plunger proper. A transverse arming stem replaces the regular in-line arm-ing stem. A retainer pin and spring-type lock nut have been incorporated. In addition, the M151 uses an anemometer-type vane. The anemometer-vane arming shaft is atta-ched to the arming stem by a spring clip. |
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Operation: Upon withdrawal of the arming wire from the arming shaft, the anemome-ter vane is free to rotate, and causes the arming stem to unscrew from the fuze. After approximately 12 vane revolutions, the arming stem has withdrawn completely from the plunger stem, and the fuze is armed. On impact, the plunger compresses the anti-creep spring and the spring-loaded firing pin forces the locking balls out into the enlarged part of the fuze cavity, freeing the firing pin. The cocked firing-pin spring forces the firing pin against the primer, initiating the delay in the primer detonator. |
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Remarks: The lenght of the anemometer-vane arming shaft varies in length, depend-ing on the fuze adapter used, and is considered a part of the fuze adapter. The Adapter M202 uses a 4-inch arming shaft, and the M200 uses a 7 1/8-inch arming shaft. |
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Depending on which M16A1 primer detonator is used, the fuze will have a 4 to 5 or 8 to 15 second delay. |
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Figure 343. Tail Fuze M151 |
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