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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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AN-M100A2, AN-M101A2, AN-M102A2 (Tail Mechanical Impact) and (Obsolete) M100 and AN-100A1 Series |
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Bombs used in |
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AN-M100A2 |
100-lb. G.P. AN-M30 250-lb. G.P. AN-M57 220-lb. Frag. AN-M88 260-lb. Frag. M81 |
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AN-M101A2 |
500-lb. G.P. AN-M43 500-lb. G.P. AN-M64 500-lb. S.A.P. AN-M58 500-lb. Incend. AN-M76 500-lb. Chem. AN-M78 600-lb. G.P. M32 |
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AN-M102A2 |
1,000-lb. G.P. AN-M44 1,000-lb. G.P. AN-M65 1,000-lb. S.A.P. AN-M59 1,000-lb. Chem. AN-M79 1,100-lb. G.P. M33 2,000-lb. G.P. AN-M34 2,000-lb. G.P. AN-M66 2,000-lb. S.A.P. M103 4,000-lb. L.C. AN-M56 |
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Functioning |
Interchangeable Primer Detonator M14 with delays of 0.01, o.o25, 0.1, or 0.24 second or non-delay | ||
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Armed condition |
When gear carries stop protrudes less than 1 inch below vane cup | ||
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Fuzes used with |
AN-M103 normally, M139, AN-M139, M140, AN-M140A1, M163, M164, M165, M135, M135A1, M136, M136A1, M166, Mk 243, T50E1, T50E4, T82, M168 | ||
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Arming time |
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| Vane Revs. | Air Travel (feet) | Minimum Vertical Drop (feet) | |
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AN-M100A2 |
150-170 | 445-485 | 40-50 |
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AN-M101A2 |
150-170 | 555 | 60-70 |
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AN-M102A2 |
150-170 | 465-665 | 85 |
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Vane span, inches |
5 (4 vanes) | ||
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Body diameter, inches |
1.5 | ||
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Over-all lenght, inches |
AN-M100A2 - 9.6 AN-M101A2 - 12.6 AN-M102A2 - 16.6 |
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Material |
cadmium plated steel with some brass parts |
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General: These three fuzes are identical except for the length of the arming stem. Larger bombs require a longer arming stem, so that the vanes can catch the air slip from the bomb. |
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Operation: As the vanes rotate, the pinion gear which is attached to the vane as-sembly revolves around the stationary gear. Since the movable gear has 30 teeth and the stationary gear 28 teeth, the movable gear is rotated clockwise one tooth per revo-lution of the pinoin gear. The arming stem is secured by a cotter pin to the movable-gear sleeve, and hence unthreads from the firing plunger as the movable gear is rotated. In unthreading, the arming stem lifts the movable gear, and, since the stationary gear is held by a collar threading into the lower extension of the movable gear sleeve, the sta-tionary gear is lifted also. After 150 to 170 revolutions of the vanes, the double-threa-ded arming stem will have unthreaded from the firing plunger and the fuze will be armed. Futher air travel will unthread the arming stem from the fuze body, and the entire as-sembly will fly off. On impact, the firing plunger will overcome the creep spring, and the striker will activate the primer detonator. |
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Early designs: The M100, M101, and M102 fuzes had a fixed delay of 0.1 second, and had 24 single threads on the arming stem. They had eight borad vanes with less pitch, and required approximately 720 vane revolutions to arm. AN-M100A1, AN-M101A1, and AN-M102A1 incorporated the interchangeable Primer Detonator M14. The A2 modi-fication then reduced the number of vanes to four, and the number of threads to 16 double threads, thus decreasing the arming time to approximately 150 to 170 vane revo-lutions. |
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Remarks: When these fuzes are used in the 260-pound Frag., 500-pound Incendiary, 500-pound, 1,000-pound, and 2,000-pound Chem., and 4,000-pound L.C. bombs, the Pri-mer Detonator M14 should have non-delay functioning. On G.P. and S.A.P. bombs, the length of the short delay will be governed by the tactical use. The 0.24 second delay primer detonator was developed for these fuzes for use in connection with the Nose Fuze Mk 243. Fuzes equipped with this primer detonator will function at a depth of 25 feet and are more accurate than the Tail Hydrostatic Fuze AN-Mk 230, especially on high-velocity impact. |
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Figure 324. Tail Fuzes AN-M100 and M160 Series |
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