ntil the beginning of 1942, when the first Lancaster came off the production line, Wallis had no way of delivering his proposed weapon to the heartland of Germany's industry in the Ruhr Valley.
Britain simply did not posses a bomber that was capable of carrying a 10 ton bomb. After some development on the bomb, Wallis managed to reduce the weight of the bomb to 7,500 pounds which was well within the lifting capability of the new Avro Lancaster.
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