|
|
| U.S. EXPLOSIVE ORDNANCE |
| PART 1 - PROJECTILES, PROPELLANT, AND PROECTILE FUZES |
| Chapter 3 - PROJECTILE FUZES |
| Section 6 - BASE FUZES FOR PROJECTILES |
|
Base Ignition Fuze Mk 8 Mods 4 and 5 (Obsolete) |
|
Projectiles used in |
1-, 3-, and 6-pounders 3"/23 Common |
|
Over-all length, inches |
Mk 8 Mod 4 - 3.61 Mk 8 Mod 5 - |
|
Diameter, inch |
Head - 0.875 |
|
|
Body - 0.625 |
|
Weight |
Mk 8 Mod 4 - 129.7 grams Mk 8 Mod 5 - 2.40 ounces |
|
Threaded lenght, inch |
1.0 |
|
Threads |
18 L.H. |
|
Material |
Body - brass or bronze Plunger post and plunger - brass Striker - cold rolled steel |
|
Description: The body of the fuze contains the plunger and the plunger post which is fitted to the plunger by a shear pin. The striker is attached by a hinge pin to the plun-ger. The primer-magazine unit is held to the body by upsetting the end inward. |
|
Operation: The fuze is assembled with the plunger in the forward position and the striker rotated on the hinge pin, which fastens the striker to the plunger so that it is not aligned with the primer. The force of set-back cuts the shear pin, allowing the plunger to ride back on the plunger post. This motion carries the striker, which straigthens out as it enters the recess in the end of the plunger post and then points at the primer cap. On impact the plunger and plunger post got forward together and fire the primer, which igni-tes the magazine. |
|
Remarks: While this is not a centrifugally actuated fuze, the firing pin is not aligned with the primer until after set-back and cannot be so aligned until the pulber has moved relative to the plunger post. |
|
Base Ignition Fuze Mk 8 Mod 4 differs from Mod 5 only in that it has the longer body with the integral external tracer assembly. |
|
Figure 103. Base Ignition Fuze Mk 8 Mod 4 |
|
|
 |
