I have been thinking about some sort of vehicle that would hover repelling the earths magnetic field, but then i realized that it would require a god awful amout of power (like the amount of power an entire country uses) so you would have to build one that would take air and push it down, and if you were going to test something like that you wouldn't want to use something explosive (like rocket fuel, someone has told me they wanted to try that, you can if you want to die, but i wouldn't) because you will more that likely crash a few times so use an electric powered fan that spins at god awful speeds or something along those lines.
