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| U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS |
| SECTION I - HIGH EXPLOSIVE BOMBS |
| PART III - U.S. NAVY "MK" SERIES BOMBS |
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U.S. NAVY |
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PRACTICE BOMBS |
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The United Staates Navy used two types of practice bombs: (a) Miniature practice bombs and (b) regular-sized practice bombs. Since the miniature practice bombs con-tain only a practice signal cartridge as a spotting charge and the regular-sized practice bombs contain neither a fuze nor a spotting charge, the information on these bombs has been condensed into the tables below. |
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MINIATURE PRACTICE BOMBS: |
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3 lb. Mks. 3, 4; |
13 lb. Mk 19 |
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OVERALL LENGTH |
8.25 in. |
13.0 in. |
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BODY DIAMETER |
2.18 in. |
2.6 in. |
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COLOR & MARKINGS |
Unpainted |
Unpainted or black |
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BODY CONSTRUCTION |
Alloy Casting |
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FILLING |
These bombs use either the AN-Mk 4 or Mk 5 Signal Cartridge. |
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REMARKS |
The AN-Mk 4 practice signal cartridge is an extra long 10-gauge shot gun shell which is inserted in the nose of the bomb. On impact the cartridge is fired, expelling a large puff of black smoke from tail of bomb. The firing device consists of two shallow cups separated by a spacer, the firing pin exten-ding through the bottom of one cup. The firing mechanism in the Mk 5 Mod 1 is more sensitive than in other marks. The Mk 5 signal cartridge is the same but filled with fluorescein, which stains the water, giving a spot of longer duration than the AN-Mk 4. Difference between bombs is primarily a difference in alloy or casting. |
| REGULAR-SIZED PRACTICE BOMBS: |
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TOTAL WEIGHT |
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LENGHT |
DIAMETER |
COLOR |
WATER FILLED |
WET SAND FILLED |
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100 lb. Mk. 7 |
41.2 in. |
8.0 in. |
Black |
48.5 lbs. |
83.0 lbs. |
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100 lb. Mk 15 |
41.2 in. |
8.0 in. |
Black |
57.0 lbs. |
100.0 lbs. |
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500 lb. Mk 5 |
67.3 in. |
16.0 in. |
Black |
360.0 lbs. |
500.0 lbs. |
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500 lb. Mk 11 |
61.8 in. |
15.0 in. |
Black |
268.0 lbs. |
448.0 lbs. |
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500 lb. Mk 21 |
61.8 in. |
15.0 in. |
Black |
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489.0 lbs. |
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1000 lb. Mk 7 |
80.0 in. |
19.0 in. |
Black |
580.0 lbs. |
1000.0 lbs. |
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1000 lb. Mk 22 |
79.0 in. |
19.0 in. |
Black |
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1013.7 lbs. |
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No fuzes are used in these bombs and they contain no spotting charge, being filled either with water or wet sand. The filling is usually stencilled on the body of the bomb. To prevent freezing and splitting of cases at high altitude, anti-freeze is added. To im-prove spotting of hits, a spotting dye is also using. |
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REMARKS |
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Mk 15 100# and Mk 21 500# are the only ones being issued now; the others are obsolete. |
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