Here's the link: http://flitetest.com/articles/air-foils/
There are many versions of the concept for this airfoil. I first saw it in the mid-80's as a paper airplane wing configuration of all things. These guys wrote a whole book on it. Of course, I ate it up being the aeronautical nerd that I have always been!
just did. im looking foreword to trying to see if this generates enough lift. i only did the wings outside the booms to keep weight down and if this doesnt work im going to do the double kf and do the inside wings too
I also made an ultra micro scratchbuilt. It was just a really small light slowstick like plane but when it flew I felt exactly the same as u did cuz it was also my first scratchbuild. It's a great feeling seeing something u built entirely on your own fly.