This is not a true general aviation airplane, but its features are noteworthy. Built by Germany’s Lange Research GmbH, this six-motor design has a 75-foot wingspan, can cruise at 135 knots, and has a 40-hour endurance. Intended for use in surveillance roles, the E2 uses six methanol-powered fuel cells and dual batteries in a hybrid propulsion setup that generates enough power to provide ice protection of leading edges and enough energy to drive radars and other high-end surveillance gear. It has a 3,638-lb max takeoff weight, can hold 660 pounds of methanol in two underwing pods, and carry a payload of 440 pounds. Manned and unmanned versions are being developed.