Wireless power system keeps UAV airborne for 48 hours.
Lockheed Martin have demonstrated a wireless power system that uses lasers to beam energy to an unmanned aerial vehicle. The ground-to-air recharging system was demonstrated for 48 hours before being shut off - but only as all the required tests had been completed, and could likely have stayed airborne for much longer. At the conclusion of the test the battery on the ‘Stalker Unmanned Aerial System’ had more energy stored than it did at the beginning.
While this test was conducted in a controlled indoor environment using a wind tunnel, the next step will be to demonstrate it outdoors to prove it is ready for commercial and military applications.