[morse1001]

Originally Posted by Kyt

I've been thinking about this for a few days and was starting to consider the differences between Sealion and Overlord. And then I find that someone else has done the work already!

Military History Online

and this site summarises the problems that a possible invasion would have encountered:

Problems with German Plans for Operation Sealion

I think the major differerance was the fact the Overlord was planned over a number of years and therefore they had time to build the equipment that they needed and Sealion which was produced in a few short months and they had to adapt existing unsuitable equipment for the invasion.

But, lets not forget, an important point was Hitler's determination to carryout the plan in the first place. Both Gehlen and Rudel both had their doubts about Hitler wanting it done and suggested that it was a stretegic deception to cover for the build up on the eastern front