delay-action bomb

A delay-action bomb is an aerial bomb designed to explode some time after impact, with the bomb's fuzes set to delay the explosion for times ranging from very brief to several weeks. Short delays are used to allow the bomb to penetrate before exploding: "a delay action bomb striking the roof of a tall building will penetrate through several floors before bursting". Similarly, a bomb with a time-delay fuze could penetrate the superstructure, deck or armour of a warship and explode inside, causing greater damage compared to the same bomb exploding outside on contact. A short delay would also prevent a fighter-bomber or ground-attack aircraft getting caught in the blast of its own bomb after a low-altitude attack. Longer delays were intended to disrupt salvage and other activities, to spread terror in areas where there could still be live bombs and to attack bomb disposal workers.

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Wikidata
aerial bomb, 
250 pound bomb, B77 nuclear bomb, Blohm & Voss BV 143, Blohm & Voss BV 246, BOLT-117, CBU-87 Combined Effects Munition, FAB-3000, GBU-12 Paveway II, GBU-16 Paveway II, GBU-28, Henschel Hs 294, HOPE/HOSBO, KAB-500L, Mark 8 nuclear bomb, Reliable Replacement Warhead, SC1000 bomb, Tsetse primary, W19, weapon type, 

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