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| ITALIAN AND FRENCH EXPLOSIVE ORDNANCE |
| Chapter 9 |
| FRENCH BOMB FUZES |
| Mechanical Impact Tail Fuze No. 3 Bis |
| Data |
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Bombs used in |
50-kg, 100-kg, 200-kg, 500-kg G.P.-H.E. |
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Fuzed used with |
Type H Model 1921 |
| R.S.A. Mle. 25, Mle. 28 and Mle. 1930 | |
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Over-all length |
16.0 in (with booster) |
| 14.5 in (without booster) | |
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Over-all length of vanes |
3.0 in. |
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Width of fuze body |
0.9 in. |
| Description |
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The body is long and cylindrical, being internally threaded at the top to receive the dome-shaped brass collar. The brass collar is internally threaded to receive the arming spindle. The arming spindle is connected to the vanes, which are six in number. The arm-ing spindle screws into the striker. Beneath the striker are the creep spring and detona-tor. The base of the body is externally threaded to screw into the bomb, and it also has external threads at the base to receive the booster. |
| Operation |
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A piece of copper wire prevents the vanes from rotating. Upon being released from the plane, the wire is broken, permitting the vanes to rotate thus withdrawing the arming spindle. The vanes and spindle may fall away and free the striker to rest on the creep spring. The fuze is fully armed when the threaded spindle is withdrawn 0.5 in. Upon im-pact, the striker overcomes the creep spring, striking the detonator, which ignites black powder in the tube. The flash goes down the flash channel to the delay and relay ele-ments respectively, which detonate the bomb. |
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Figure 272 |
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