I know it sounds mad, just rember my dad and some others telling me about it. They put a lightning on the front of a UK carrier were the harrier ski jump is, started it up and went for it. The thrust from the 2 engines was so much that it could lift it's self into the air. But they only did it as a test to see if it could be done. It was on a TV doc I think but I missed it as you do.