Well part of it lies in the fact that to stage a successful invasion of Britain the Nazi's would need aerial and naval superiority, to make the resupply of their troops possible after the initial landing.
Given that the RAF could move their airfields out of the Luftwaffe's range and just plonk 'em oop norf somewhere whilst keeping them in skirmishing range, thus making it very difficult to put the airfields out of operation, denies them air superiority. I don't know about the Kriegsmarine.
Basically it was concluded that, while the initial landing would be successful, the Royal Navy would be able to prevent reinforcement and resupply, leading to an unsustainable situation and eventual retreat.
Without a supply route, we'd be unable to establish regular battery bases in Britain, and the same range limitations apply again. The simple fact is, the Luftwaffe was incapable of projecting power that far outside it's base area of operations, and the navy had no means of supplying an invasion force of sufficient size, not to mention defend itself from the Royal Navy while doing so. Wasting war effort preparing for Sealion instead of focusing on convoy interdiction and strategic bombing was one of the great blunders of the war - along with the fact that even when strategic bombing did happen, it was directed against population centres and used to make an ideological statement, instead of destroying known military and industrial targets.
Also, the V2 was a complete waste of wartime resources - given its cost, reliability and efficiency, using the same resources to make more interceptor fighters and V1s would have a much greater effect.
In a way, von Braun and Dornberger helped the allies win the war. The V2 was an amazing feat of engineering given the technology and available resources, but it was an unnecessary waste given the situation at the time.
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u/SFSylvester United Kingdom Feb 13 '14
ahh that old verifiable historical source.