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D.P. 12,000-lb. Mk I, "Tallboy", (Service) |
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Filler and Weight | ||
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| TNT, | |||
| Body and Overall Weight | |||
| Cast steel, 11,885 lb. | |||
| Color | |||
| Green over-all; red band near nose | |||
| Type of Round, DODIC | |||
| Tallboy, D.P., NA |
| Description: |
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| The bomb body is manu¬factured of cast steel, with a solid nose plug, and with three exploders fitted 1201" apart in the base plate. The bombs arc issued with ex¬ploders inserted, and the exploder tubes are seated with shipping plugs. The tail is attached to the after end of the bomb body by 12 studs. A cylindrical metal cowling, placed between the bomb body and the tail cone, enhances the streamlining of the bomb. The bomb body contains an explosive filling of Torpex with a one-inch layer of TNT topping added to the after end. Four inches of wood-meal/wax composition is then added, and the filling sealed with a 1/2-in. ply board washer. The three exploders pass through holes in this washer and are held in place by a heavy base plate, which is secured by bolts to the bomb body. |
| Use: |
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| These bombs were designed for special operational uses to give deep penetration of the earth and to produce heavy shock 'waves as a result of the explosion of their main charge. They have a charge-/weight ratio of about 45%, and are not intended for use as armor- or concrete-piercing bombs. The two sizes of bombs are identical in all respects, the 22,000-lb. D.P. being merely an enlarged version of the 12,000-lb. D.P. A rather unusual feature of these bombs is the use of a cowl between the bomb body and the fail assem¬bly to enhance their streamlining. Both DP, bombs are tail fused only, each bomb using three Tail Pistols No. 58 located 120 degrees apart in the base plate. |
| Functioning: |
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| The special tail unit, No. 78 Mk I, is constructed of light alloy and consists of a cone to which are attached four fins of streamlined cross-section. The tins are set at an angle of 5" to the axis of the tail cone, giving a slight right-hand spin to the bomb as it falls. The tail fits over twelve 7/16-in. studs fitted into the bomb body, and is securely fastened to the studs by Simmonds nuts. Three hand-holes in the tail cone give ready access to the three tail pistols. |
| Munition Components: |
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| Data Source: |
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| OP 1665 Explosive Ordnance British 1946 |
| Munitions Tech Data Sheet: |
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