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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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M160, M161, M162, AN-M100A2C, and AN-M101A2C (Tail Mechanical Impact) |
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Bombs used in |
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M160 |
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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M161 |
500-lb. G.P. AN-M64 (AN-M43) 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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M162 |
1,000-lb. G.P. AN-M65 (AN-M44) 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-M66 (A1, A2) 2,000-lb. S.A.P. M103 4,000-lb. L.C. AN-M56 |
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Functioning |
Primer Detonator M14 with delays of 0.01, 0.025, 0.1 and 0.24 seconds and non-delay | ||
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Armed condition |
When gear carries stop protrudes less than one inch below vane cup | ||
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Fuzes used with |
M163, M164, M165 normally, AN-M103A1, AN-M103, M138, M139A1, AN-M139A1, M140, M140A1, AN-M140A1, Mk 243 | ||
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Arming time |
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| Vane Revs. | Air Travel (feet) | Minimum Vertical Drop (feet) | |
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M160 |
720 | 1,780 - 1,950 | 650 |
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M161 |
720 | 1,910 - 2,230 | 805 |
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M162 |
720 | 1,710-2,680 | 1,130 |
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Vane span, inches |
5 (four vanes) | ||
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Body diameter, inches |
1.5 | ||
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Over-all lenght, inches |
M160 - 9.6 M161 - 12.6 M162 - 16.6 |
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Material |
Cadmium plated steel; some brass parts |
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General: The Mechanical Impact Tail Fuzes M160, M161, and M162 are similar to the AN-M100A2, and AN-M102A2 respectively, except for the arming stem, which has finer threads (28 single threads to the inch against 20 double threads in the AN-M100 series) and a longer engagement with the firing plunger (0.75-inch against 0.50-inch). The M160 series fuzes are distinguished externally from the AN-M100 group by a yellow band three inches wide painted around the arming-stem case. |
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The slower arming is desired in order to prevent the premature explosion of bombs within the range of releasing aircraft. This has been caused in the past by bombs bump-ing each other after being dropped in clusters or in salvo at high altitudes by very heavy bombers. In addition, the bomb bays of the B-29's are subjected to considerable air tur-bulance, distorting the fall of the bombs, thereby increasing the hazard of premature ex-plosion and dictating the need for slower arming. |
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Operation: The operation is similar to the fuzes of the AN-M100 series, except for the incorporation of a longer arming time in the M160 series. |
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Remarks: When these fuzes are used in 260-pound Frag. Bombs M81, the 220-pound Frag. Bombs AN-M88, the 500-pound Incendiary Bombs AN-M76, the 500-pound Chemical Bombs AN-M78, the 1,000-pound Chemical Bombs AN-M79, and the 4,000-pound L.C. Bombs AN-M56, the Primer Detonator M14 should have non-delay functioning. |
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The first of the slower-arming tail fuzes produced were designated as the AN-M100A2C series. These have the same number of threads per inch as the M160 series, but have the shorter engagement of the AN-M100 series fuzes. The yellow band is pain-ted on, as in the M160 series fuzes. |
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Figure 324. Tail Fuzes AN-M100 and M160 Series |
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