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| U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS |
| SECTION II - INCENDIARY & CHEMICAL BOMBS |
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DATA: |
M74 |
U.S. ARMY BOMB |
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10 LB. INCEND. |
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OVERALL LENGTH |
19.4 in. |
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BODY LENGTH |
19.4 in. | ||
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BODY DIAMETER |
3.0 in. | ||
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WALL THICKNESS |
M74 Incendiary |
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TAIL LENGTH |
6.3 in. |
(Service) |
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TAIL WIDTH |
2.5 in. | ||
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TAIL WEIGHT |
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WEIGHTS: |
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Type of Filling |
PT 1 or NP | ||
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Weight of Filling |
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Total Weight |
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Chg/Wt. Ratio |
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FUZING: |
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M142, M142A1, M3 |
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BODY CONSTRUCTION: |
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Same type of construction as the AN-M69 6 lb. oil incendiary, with a sheet steel leak-proof casing, and a nose cup housing the fuze. A small chemical container, lo-cated immediately behind the dome of the nose cup, is filled with white phosphrous to aid ignition of the incendiary composition and produce smoke. In bombs with NP, the filling is enclosed in a cheesecloth sock; if PT 1 is used, it is loaded directly into the bomb. |
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TAIL CONSTRUCTION: |
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The M74 has a telescope type tail which fits inside the tail cup and is ejected under spring pressure when the bomb is released from the cluster. A well inside the tail cup holds the tail sleeve when the assembly is compressed in the cup. |
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SUSPENSION: |
| Cluster | Cluster Adapter | Size | No. of Bombs Carried | Status | |
| E6R2 | 500 lb. |
38 M74 |
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| Aimable | |||||
| E48 | M23 | 500 lb. |
38 M74 |
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| Aimable | |||||
| E61 | M23 | 500 lb. |
38 E5R8 |
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Aimable |
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OPERATION: |
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The M142 (or M142A1) fuze striker ignites the primer which sets off the booster and main ejection charge. This activates the auxiliary ejection-ignition charge. Ex-panding gases rupture the dome shaped ejection diaphragm, which forces the WP filled cup, incendiary filling, tail cup, and tail assembly out of the bomb casing. |
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REMARKS: |
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Do not reinsert arming pin after it has been ejected, as it may cause the fuze to function. |
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The experimental bombs of this type with other fillings are designated the E5 series. The experimental bomb with a white phosphorous filling has been rejected; however, the one with the mustard filling, E5R8, is still under development. This bomb will be carried in the E61 cluster holding 38 bombs (M23 cluster adapter - page 119). |
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For Color and Markings, see Introduction, page 100 |
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