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| Fuzes for Rockets and Projector Charge |
| Chapter 8 |
| BASE FUZES FOR FIN STABILIZED AIRCRAFT ROCKETS |
| Section D - Nose Fuze Mk 164 Mod 0 (Pressure Arming, Impact Firing) |
| 1. General Data |
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Used in: 5.0-inch Rocket Head Mk 6 Mod 1 (General Purpose) |
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Overall dimensions and weight of fuze: |
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Length |
6.18 inches |
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Diameter (maximum) |
3.2 inches |
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Body threads |
2.75 inches - 14 NS-2 |
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Weight |
3.40 lbs. approx. |
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Applicable specification: OS 3675 |
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General arrangement drawing: 561460 |
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Sketch list of drawing & specs: 165239 |
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Explosive components: |
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Delay detonator assembly (adapted from the delay detonator assembly of Fuze Mk 157). The assembly consists of a mercury fulimate Percussion Primer Mk 106, an expan-sion space, the 0.015 second black powder delay element and the Relay Detonator Mk 42 Mod 0 (lead azide) assembled in a single case closed by a crimp and contained in shut-ter. |
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Booster lead-in charge contained in the lead-in and shutter lock assembly (0.243 grams tetryl). |
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Booster charge (approximately 12 grams tetryl) contained in magazine. |
| 2. Description |
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General. The Fuze Mk 164 Mod 0 is essentially the same as Fuze Mk 159 Mod 1 with the following exceptions: |
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1. The lead-in and shutter lock assembly of Fuze Mk 163 replaces the lead-in disc of Fuze Mk 159. |
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2. The shutter is hinged at both ends of the hinge-pin and two detents are used as in Fuze Mk 163. |
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3. The possible gap of 0.058 inches between the detonator and the lead-in is reduced to 0.025 inches for more positive assurance of high order functioning. |
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4. The Fuze Mk 164 uses an Inconel mesh filter covered by a plain flat washer. |
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Figure 41 – Base Fuze Mk 164 Mod 0, External
View Full Size (approximately) |
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Use. Fuze Mk 164 is used in the 5.0-inch General Purpose Fin Stabilized Aircraft Rock-ets (Complete Rounds) Mk 4 Mod 0 and Mk 26 Mod 0 (see OP 1415). A Nose Fuze Mk 149 which can be fired instantaneous or safe is usually assembled in the nose of the rocket head to provide preselective fuze action of either instantaneous or 0.015 second delay. The complete round is used against tanks, locomotives, gun emplacements, and similar targets. |
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Functioning mechanism. The functioning mechanism of Fuze Mk 164 is the same as Fuze Mk 163. |
| 3. Functioning |
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Arming. Arming of Fuze Mk 164 is identical with Fuze Mk 163. |
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Firing. Firing upon impact is identical with Fuze Mk 163. |
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Acceptance test data. Same as Fuze Mk 163. |
| 4. Safety Features |
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Same as Fuze Mk 157. |
| 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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