"A family of proof-of-concept demonstrators in the 23 m-class have been built after the Airworm idea and numerous outdoor test flights confirming the advantages listed above, have been concluded."
When you say...
"There are ten versions of the Air Chain/Sky Dragon."
Do you mean ten have actually been built and exist? Or do you mean ten are talked about like GlobeTel talked about their Strat and what it could do for years while it never actually existed.
Please link to some photos and info about the one that is two football fields long...