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T-12 casing at the United States Army Ordnance Museum, Aberdeen Proving Ground, Aberdeen, Maryland.

The T-12 (also known as Cloudmaker) demolition bomb was developed by the United States from 1944 to 1948. It was one of a small class of bombs designed to attack targets invulnerable to conventional "soft" bombs, such as bunkers and viaducts. It achieved this by having an extremely thick hardened nose section, which was designed to penetrate deeply into hardened concrete structures and then detonate inside the target after a short time delay. This created an "earthquake effect".

The T-12 was a further development of the concept initiated with the United Kingdom's Tallboy and Grand Slam weapons: a hardened, highly aerodynamic bomb of the greatest possible weight designed to be dropped from the highest possible altitude. Penetrating deeply in the earth before exploding, the resulting shock wave was transmitted through the earth into structures. The resulting camouflet could also undermine structures. The bomb could also be used against hardened targets.

Originally set to meet a 42,000 lb (19,000 kg) target weight (the maximum payload for the Convair B-36 "Peacemaker" bomber), the original design with its hardened case was slightly less than 43,000 pounds. The final T-12 weighed 43,600 lb (nearly 20 tonnes). This was twice the size of the United States' previous largest bomb, the Bomb, GP, 22,000-lb, M110 (T-14), the American-built version of the British Grand Slam. The T-12 was not a simple scale up of the M110, but incorporated modifications based on testing and calculations. The B-36 was redesigned so it could carry the T12, although a converted B-29 Superfortress was used for testing.

Similar US Weapons[edit | edit source]

Weapons of comparable size to the T-12, such as the BLU-82 and GBU-43/B Massive Ordnance Air Blast bombs (MOAB), were developed as latter-day United States superbombs, but their utility is limited outside the realm of psychological weapons and demolition. Only the GBU-43/B remains in the inventory. It is not hardened and lacks the hard target capability of the T-12 and its cousins. The 14 metric ton mass Massive Ordnance Penetrator, roughly intermediate between the British Grand Slam and American Cloudmaker bombs in mass, has been recently developed just past the dawn of the 21st century in light of unsatisfactory penetration by existing 2000 lb and 5000 lb class weapons.

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