The W40 nuclear warhead was an American nuclear warhead developed in the late 1950s and which saw service from 1959 to 1972. It was a fusion boosted fission (but not themonuclear) bomb type.The W40 design was reportedly the common Python primary or fission core used by the US B28 nuclear bomb, W28 nuclear warhead, W40 nuclear warhead, and W49 nuclear warhead.The W40 was 18 inches in diameter, 32 inches long, and weighed around 385 pounds. It had a design yield of 10 kilotons.
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