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| U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS |
| SECTION I - HIGH EXPLOSIVE BOMBS |
| PART I - U.S. ARMY "MODIFIED MARKS" SERIES BOMBS |
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This particular series of bombs was not satis-factory for war use and has been abandoned, except for a few of these bombs which are being used at the present for target practice and trai-ning purpose. They are all of the same type and are intended for the same target use: Army De-molition H.E. bombs for General Bombardement. The following chart contains the essential data concerning the bombs of this series |
U.S. ARMY BOMBS |
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"MODIFIED MARKS" |
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(Obsolete) |
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U.S. ARMY "MODIFIED MARK" SERIES BOMBS |
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BOMBS |
100 lb. | 300 lb. | 600 lb. | 1100 lb. | 2000 lb. | 2000 lb. | ||||||
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Mk I |
MIV |
Mk I |
MII |
Mk I |
MIII |
Mk III |
Mk I |
Mk I |
MIII |
Mk I |
MIV |
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& |
MIV |
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FUZES |
Nose: M105 |
Tail: M106 |
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OVERALL LENGTH |
47.2" |
51.2" |
63.0" |
68.5" |
135.8" |
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LENGTH OF BODY |
39.5" |
40.6" |
52.2" |
61.6" |
97.0" |
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BODY DIAMETER |
7.9" |
12.2" |
16.5" |
20.8" |
18.5 |
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WALL THICKNESS |
0.16" |
0.12" |
0.2" |
0.15" |
0.50" |
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WALL MATERIAL |
Steel |
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BODY CONSTRUCTION |
Streamlined body formed by welding three cast steel sections together. |
Cast steel, |
Seamless steel tubing. |
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TYPE OF SUSPENSION |
Horizontal |
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CONSTRUCTION OF |
Two U-shaped bar steel eyebolt welded to body along longitudinal axis. |
Two U-shaped eyebolts on plates secured to body by cap screws |
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COLOR & MARKINGS |
Prior to March 11, 1942, these bombs would have been yellow all over with black manu-facturers markings, but since that date will be olive-drab with one inch yellow bands around nose and base and a 1/4 inch band around center of gravity. |
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LENGTH OF TAIL |
8.5" |
12.0" |
14.0" |
33.5" |
49.2" |
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WIDTH OF TAIL |
11.0" |
15.0" |
20.5" |
28.5" |
26.1" |
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MATERIAL OF TAIL |
Sheet Steel |
Sheet steel with cast steel tail cone. |
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TAIL CONSTRUCTION |
A cast steel sleeve secured to body by a fin locking nut four fins or vanes; internal box-type struts. |
Four vanes with bar struts, at-tached to body by screws. |
Four vanes riveted to tail cone; two sets external bar struts to reinforce vanes. Cone secured to flange on base plate. |
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WEIGHT OF TAIL |
2.6# |
6.1# |
5.0# |
55.0# |
140.0# |
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TYPE OF FILLING |
Cast TNT |
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WEIGHT OF FILLING |
65.0# |
148.0# |
355.0# |
650.0# |
960.0# |
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TOTAL WEIGHT |
119.4# |
285.9# |
611.0# |
1175.0# |
1920.0# |
1820.0# |
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CHARGE/WEIGHT |
54.5% |
52.0% |
58.0% |
55.3% |
50.0% |
52.4% |
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