Found this site on lifter technology. Basicly a triangle with balsa wood struts covered in aluminum foil with a wire above the foil. When you add a
voltage the construction rises into the air.
Although the voltage requirements are way too steep for large craft I really think they are onto something here for future engineless craft.
Any one ever made one of these and tested it? Here's a couple links.
Lifters Scoll down to where it says lifter project.
Looks like the main hurdle talked about in the post is the power supply. The links show some pretty basic and cheap ones including using an old
computer monitor as a power supply.