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| ITALIAN AND FRENCH EXPLOSIVE ORDNANCE |
| Chapter 9 |
| FRENCH BOMB FUZES |
| Mechanical Impact Nose Fuze Type H Models 1921 and 1929 |
| Data |
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Bombs used in |
10-kg Anti-Personnel, 50-kg D.T. No. 2 G.P.-H.E. |
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Fuzed used with |
Alone in 10-kg 3 bis or Sch.R. Tail Fuze in 50-kg |
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Over-all length |
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(With booster) |
5.6 in. |
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(Without booster) |
4.6 in. |
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Over-all length of vanes |
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Model 1921 |
3.5 in. |
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Model 1929 |
3.25 in. |
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Width of fuze body |
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Model 1921 |
1.2 in. |
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Model 1929 |
1.3 in. |
| Markings | 24/31 H Mle 21 or 29 |
| Description |
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These fuzes are similar in outward appearance, differing mainly in size and detonator as-sembly, but both are easily distinguished by the square eyebolt on the upper cap. Six-teen vanes are formed on a ring riveted to the cap. The base of the eyebolt has a bolt formed with it which screws into the striker. Between the striker plate and the upper locking ring of the body are six steel balls. |
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A brass ring is screwed over the main brass fuze body and secured by a set-screw. The striker is held in place by a steel threaded pin through the fuze body which passes through the lower protion of the slot in the striker. A brass shear pin also passes through the slot and the body. |
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The model 1921 has a long booster containing a detonator, a booster charge on the de-tonator, and delay, relay, and booster charges. The model 1929 has a short detonator holder containing a detonator cap, delay, and relay. These fuzes may give instantane-ous, short-delay (0.05 sec.) or long-delay (0.15 sec.) action, depending on the delay pellet used. |
| Operation |
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As the bomb is released, the safety pin is withdrawn, freeing the vanes. When vanes have rotated sufficiently, steel balls fall out and finally the vanes completely unscrew and fall out, carrying the suspension eyebolt with them. The striker is now held only by the shear pin. On impact, the striker shear the pin and hits the detonator. |
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Figure 264 |
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