Lockheed Martin and LaserMotive recently managed to keep a drone, the Stalker Unmanned Aerial System (UAS), flying for 48 hours on a laser-guided recharging system. Its on-board batteries can maintain flight for two hours, so the demonstration improves endurance by 2,400 percent. Your editor admits to possibly over-healthy skepticism regarding transmittal of power to aircraft, remembering early NASA demonstrations that were noisy and more lightning-like than focused. LaserMotive’s technology seems to overcome these objections. Stalker is described by Lockheed-Martin as “a small, silent UAS used by Special Operations Forces since 2006 to perform intelligence, surveillance and reconnaissance missions.” The miniature plane weighs a little over six kilograms (13.2 pounds) and has a wing span of three meters (9.84 feet). As shown …