@Jedimindtricks Abgesehen von der erreichbaren Höhe könnten es die hier sein:
"The United States Army has ordered a huge hybrid airship longer than a football field to watch over battlefields in Afghanistan by the end of 2011, according to the airship's builder Northrop Grumman Corporation.
The company has received a $517 million Army contract to build up to three of the huge military airships, called the Long Endurance Multi-Intelligence Vehicles (LEMV). Such airships would serve as surveillance stations at 20,000 feet (6,096 meters) above sea level and could stay on watch for as long as three weeks at a time.
A LEMV would also have the capability to carry a 2,500-pound (1,113 kg) payload, and still zip along at 92 mph (148 kph) if necessary. The 302-foot (92-meter) airship would typically have a cruising speed of just 34 mph (54.7 kph).
That represents a staying power for intelligence, surveillance, and reconnaissance over a longer period of time than what today's robotic drones such as the Predator or Reaper can provide.
"Our offering supports the Army's Joint Military Utility Assessment that this disruptive innovation must meet the Army's objective of a persistent unblinking stare while providing increased operational utility to battlefield commanders," said Alan Metzger, Northrop Grumman LEMV program manager.
A heavy-lift configuration could transform the LEMV into a sky transport that carries up to 15,000 pounds (6,803 kg).
The U.S. Army has also conducted military airship field trials for a tethered balloon that would carry radar to help weapon systems track and shoot down cruise missiles."
http://www.space.com/8615-army-orders-huge-airship-aid-combat-missions.htmlAnsonsten gibt es da noch die "Argus One", aber die kommt auch nicht auf diese extreme Höhe:
"Drones and satellites dominate the U.S. military's surveillance arsenal, but fleets of unmanned airships could soon join in keeping an eye on battlefields. One robotic airship contender, the modular Argus One, has upcoming flight demonstrations scheduled at a U.S. Department of Energy Nevada Test Site that hosted nuclear bomb tests during the Cold War.
The Argus One's design resembles a segmented sky worm made of connecting modules, and has the flexibility to quickly change its flight path as it slinks through the sky. It can also carry 30 pounds of surveillance sensors or cameras — true to its name taken from an all-seeing Greek god with 100 eyes. U.S. Department of Defense observers plan to watch it in action during the scheduled December flight tests."
http://www.innovationnewsdaily.com/690-argus-one-airship-flight-test.html (Archiv-Version vom 05.03.2012)http://www.wallstreet-online.de/nachricht/4411548-argus-one-us-armee-spionagedrohne