Accumulators in aircraft store considerable amounts of energy. No surprise, then, that their behavior when struck by a bullet is of great interest to designers of military planes. There are stringent ballistic fragmentation specs that dictate how aircraft accumulators must perform when hit by live fire. Designers routinely meet these specs, but only by liberal use of heavy steel and Kevlar in the accumulator housing. The downsides to this design strategy are the extra cost and weight of the Kevlar. The extra layers also can take up appreciable space.
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