Only Human Power is permitted – no motors, rockets, battery power or sneaky elastic bands. Usually Red Bull Flugtag flying machines range from realistic plane replicas to anything the imagination can conjure up. Past crafts include a Flying Purple People Eater, Santa and his sleigh, a flying toilet and even a flying cheeseburger. To gain more showmanship points, participants often wear outrageous costumes, act out skits and create their own music soundtracks for the flight.     Part of the jury will be the rap singer 100 Kila, the Tv host Alexander Kadiev, the actor Alexander Sano and the journalist Dragomir Simeonov. The event starts at 10:30 a.m. and  is free to the public. Booking hotels in Varna