Context -- You can build a "ufo" (ion wind lifter) yourself, many have[1]. The power to weight ratio is roughly equal to that of a helicopter, so it's not trivi

Context -- You can build a "ufo" (ion wind lifter) yourself, many have[1]. The power to weight ratio is roughly equal to that of a helicopter, so it's not trivial, but it could in theory be scaled up to large enough to move battle tanks around on. You'd end up with a large dark craft that glows a bit around the edges. That's old physics, who knows what's been done since then. 1 - http://jnaudin.free.fr/html/liftbldr.htm