Hahaha! I can't believe you found this video. The designer went through 5 revisions and none were successful. Zak was his test pilot and Zak never wanted to fly it in the first place. Actually the 4th rev design flew for about 2 minutes and crashed in the pitts almost killing me and another pilot. IMO Zak never had control of that ring wing, he's just banging the sticks and hoping it flies itelf.