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Self sealing fuel tanks : fuel tanks that can seal themselves after being punctured by a bullet. Self sealing fuel tanks were invented back in WWII, but they are even today an area of research. Sadly, even now they aren't standard on all military aircraft, it's an optional extra.

"Self-sealing tanks have two layers of rubber, one of vulcanized rubber and one of untreated rubber that can absorb oil and expand when wet. When a fuel tank is punctured, the fuel will spill on to the layers, causing the swelling of the untreated layer, thus sealing the puncture." (source: Wikipedia)

A propaganda video from WWII:

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cheeni

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