Mechanisms that Fly

(maybe across a table, anyway)

Screech! and you've got the Halloween mood all year long.

I want to build working wings that function with springs (that you wind up) and can be triggered. I think they should be made from tubular metal, like aluminum. I may hack umbrellas or build from scratch, but the system has to be strong enough to move wind without falling apart. The ultimate goal is a winged thing that rolls across the floor by its own wind generating ability. And to scare people. That would be fun, too.