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If you mean the 2 bombs dropped on Japan in WW2, they were dropped from B-29 heavy bombers using Norden bombsights to visually locate the AP for release. The bombs were released from about 30,000 ft and were radar fused to detonate at between 1,500 ft to 2,000 ft as airbrushes.

Later many but not most of US & USSR test shots were dropped using a wide variety of bombers and fighters on test sites, but most were not dropped at all but were a variety of fixed test shots: on towers, hanging from tethered balloons, surface bursts, barges, underground, etc., a few were rocket launched detonated in space.

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12y ago

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