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| U.S. EXPLOSIVE ORDNANCE |
| PART 1 - PROJECTILES, PROPELLANT, AND PROECTILE FUZES |
| Chapter 3 - PROJECTILE FUZES |
| Section 3 - NOSE TIME FUZES FOR PROJECTILES |
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Mk 50 and Mk 51 |
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Projectiles used in |
Mk 50 |
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4"/50 Illuminating |
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4"/25/38/51 A.A. Common |
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5"/25/38/51 Ill. |
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5"/38 Window |
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5"/38 W.P. |
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5"/51 H.C. |
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6"/47/53 H.C. and Ill. |
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8"/55 H.C. |
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| Mk 51 | |
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3"/23/50 A.A. and Ill. |
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4"/50 H.C. |
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Setting times, seconds |
Mk 50 - minimum, 0.6 |
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maximum, 45 |
| Mk 51 - minimum, 0.6 | |
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maximum, 30 |
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Description: The Nose Time Fuze Mk 50 and Mk 51 are merely moisture-resistant ver-sions of the Nose Time Fuze Mk 18 Mods 2, 3, and 4 and Mk 22 Mods 4, 5, and 6, res-pectively. The size, operation, component parts (except as noted below), firing train, and setting times are identical to those of the Nose Time Fuzes Mk 18 and Mk 22. |
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Moisture Resistance: The following developments prolong the life of the mechanism and the explosive. A silica gel bag to absorb moisture is placed in the base cavity of the fuze. Special gaskets are placed between the upper cap and the lower cap, and between the lower cap and the body. The joint between the upper cap and the lower cap is coa-ted with bakelite varnish. The primer unit ends are covered with bakelite varnish. Thread luting compound is applied to the joint between the body and the bottom closing screw. The brass disc at the center of the bottom closing screw is crimped in under a washer and then coated with bakelite varnish. All screw heads visible on the outside are coated with glyptol lacquer. |
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Remarks: Different modifications of these fuzes indicate nothing more than different manufacturers. |
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Figure 92. Nose Time Fuze Mk 42 |
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