Explosive Trains in Fixed Round of Artillery Ammunition

Fig 1-2lb EXPLOSIVE TRAINS IN FIXED ROUND OF ARTILLERY AMMUNITION 

The function of this fuze is to initiate, following a delay of 0.035 second after impact with steel armor plate, a high-order expln in the filler of projectiles from 6 to 16 inches in diam. The central axial assembly of the fuze, which is mounted on ball races, moves 

It differs from stab primer in two respects firstly its housing is stronger and is not punctured during actuation, a characteristic which makes possible maintenance of a gas seal on the next element, the delay pellet and secondly, it is inherently less sensitive to impact than the stab primer 

The hot gases from the percussion primer permeate thru the baffle and initiate the BkPdr delay pellet, which burns under the reproducible pressure conditions which are obtained within the delay element housing, with a delay time of 0.035 sec. When the BkPdr element has burned thru, a spit of flame impinges on a detonator loaded with LA a true detonation develops and progresses successively thru the Tetryl-loaded lead-out, the Tetryl-loaded booster lead-in, the Tetryl-loaded booster and Explosive D (Ammonium Picrate) -loaded main (or bursting) charge of the projectile. 

Some fuzes contain also a relay (See Glossary, Section 2, Part A) 

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In Fig l-21b is shown a complete explosive train (comprising both low- and high-explosive trains) in fixed round of artillery ammunition... 

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