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| Fuzes for Rockets and Projector Charge |
| Chapter 8 |
| BASE FUZES FOR FIN STABILIZED AIRCRAFT ROCKETS |
| Section E - Nose Fuze Mk 165 Mod 0 (Pressure Arming, Impact Firing) |
| 1. General Data |
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Used in: 5.0-inch Rocket Head Mk 1 and Mk 1 Mod 1 (General Purpose) |
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Overall dimensions and weight of fuze: |
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Length |
6.97 inches |
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Diameter (maximum) |
3.885 inches |
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Body threads |
3.625 inches – 12 NS-2 |
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Weight |
5.3 lbs. approx. |
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Applicable specification: OS 3817 |
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General arrangement drawing: 561458 |
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Sketch list of drawing & specs: 165240 |
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Explosive components: |
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Delay detonator assembly (Same as Fuze Mk 163 Mod 0 and 1) |
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Booster lead-in charge contained in the lead-in and shutter lock assembly. |
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Booster charge (approximately 12 grams tetryl) contained in magazine. |
| 2. Description |
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General. Fuze Mk 165 Mod 0 is a modification of Fuze Mk 157 Mod 0. The functioning mechanism is essentially the same except that it contains the improved shutter and lead-in and shutter lock assembly from Fuze Mk 163. The fuze head and fuze-to-motor adapter are made in one piece to improve the seal between the rocket motor and the in-terior of the rocket head. |
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Figure 42 – Base Fuze Mk 165 Mod 0, Partial
Cross Section View, Unarmed Position |
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Use. Fuze Mk 165 Mod 0 is used in the 5.0-inch General Purpose Fin Stabilized Aircraft Rockets (Complete Rounds) Mk 1 Mod 2, Mk 1 Mod 4, and Mk 1 Mod 5 (see OP 1415). The rocket is nromally fired with a Nose Fuze Mk 149 assembled in the rocket head to permit pre-selective fuze action of instantaneous or 0.020 second delay. The round is used against personnel and light targets. |
| 3. Functioning |
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Arming. The arming of Fuze Mk 165 is identical with Fuze Mk 164. |
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Firing. Firing upon impact is identical with Fuze Mk 164. |
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Acceptance test data. Fuzes selected for functional test are assembled with explo-sive loaded 5.0-inch Rocket Heads Mk 1 fitted with flat nose shipping plugs and 3.25-inch Rocket Motors Mk 7 and fired from a surface launched at approximately 15 degrees ele-vation for water impact. Acceptance is based on a cumulative test plan to accept (95% of the time) lots in which 92% of the fuzes function satisfactorily; lots poorer than 92% will be subject to rejection with lots 78% effective being rejected 90% of the time. |
| 4. Safety Features |
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Same as Fuze Mk 157. |
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Fiugre 43 – Base Fuze Mk
165 Mod 0, External View, |
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| 5. Disposal and Servicing (Maintenance) |
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Same as Fuze Mk 157. |
| 6. Installation Instructions |
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Same as Fuze Mk 157. |
| 7. Packing and Marking. |
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Same as Fuze Mk 157. |
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