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Easy, the F-35A and they have said as much (not sure if it was DoD, JPO, or a LM rep that said it).




There would have still been just a single engine as this was a demand of the USAF.



The position of the weapons bay is dictated by the size of the single, large engine.  Btw, the size of the bay is driven by the F-35C requirement of a 2k bomb as the F-35A originally had a requirement for only a 1k bomb.



The engine and weapons bay dictate the overall cross-section of the F-35.



Since the cross-section is a given, then the length cannot be increased much because it would make it too heavy which would dictate a larger engine.


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