CNN CNN Newsroom June 17, 2013 14:57:00
Roadblock. instead of being silhouetted against the sun, the flying bike stayed low a total of six propellers that look like fans provide the lift, powered by batteries. it was operated by remote control. >> translator: i have to say it is already good control. i can fly it without problems. à>> reporter: three czech companies collaborated on the. >> iing br)q it warmed the heart of a window washer. >> that's what we need to clean windows. that would be great. i'm going to talk to my boss, to see if we can buy some o# those we can be flying. >> reporter: one tiny problem. flight time is limit...