Thanks for redirecting my attention to the video & link. That's some interesting stuff. When I was a kid the USN was experimenting with a VTOL aircraft with counter-rotating props. It looked like a stubby-winged airplane (4 wings) set on it's ass. I think it was called "Pogo", like a pogo-stick. I saw one (sort of) demonstrated at NAS Oceana back in the 1950's. They just spun it up and lifted it a few feet and set it back down. I'll bet the pilot was shytting concrete terds.

If only we can bring sex into this thread, we can get it completely off!