Originally posted by T. A. Gardner
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Germany's heavy water reactor likely wouldn't have even worked on the first few tries and would have required an entire redesign of the fuel from 1 kg blocks on necklaces of stainless steel wire to a more stable and regular configuration.
While either Britain or Germany might have done a graphite moderated reactor like the one Fermi had pre-war at the University of Chicago, this would have been only a starting point for practical development.
So, without a massive program that used mass quantities of electricity in one case and mass produced reactors in the other neither could manufacture the necessary fissile material to produce a working bomb.
So, without a massive program that used mass quantities of electricity in one case and mass produced reactors in the other neither could manufacture the necessary fissile material to produce a working bomb.

As for delivery, a US bomb design of 1945 could have weighed as little as 4,000 lbs. Almost 50% of the weight of the first bombs used was armor plating on the bomb to make it flak resistant. Remove that armor and you get a roughly 5,000 lb bomb. Take out another 1,000 in casing and structure to support that weight and you're at 4,000 lbs.
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