The Slim rotor is 8 meters in diameter!
Whit this construction method one can build huge rotors:
in the pdf details are given to built up to 18 meters diameter.
More about the history and construction see: Download the english version of the construction details here
The yellow white red is only 800mm long and can fly like a kite!
the bleu, black and white is 2500mm long. It's flying capacities have not been tested. VIDEO Archimedes in flight