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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 …