"We are confident that our design concept meets or exceeds all requirements, both environmental and operational. The next task—and the real challenge—is to fabricate a prototype and to fly it to prove that the detailed engineering design is viable," Browning said.
Ich würde das nicht so übersetzen, das es bereits Stratosphären-Luftschiffe gibt.
Trotzdem vielen Dank für den Link.
http://www.lockheedmartin.com/akron/protech/aeroweb/aerostat…