cartechboy writes: People get concerned about "range anxiety" with electric cars — but how about a plane? California-based GreenWing International recently announced the release of its first 50 eSpyder electric aircraft. The single-seat, kit-built plane will be sold for $39,990 and is held in the air by a 24-kilowatt (32-horsepower) electric motor with a 13-kilowatt-hour lithium-ion battery. The eSpyder has a max speed of 68mph and can fly for 60 to 90 minutes on a fully charged battery. Recharging takes 2 to 3 hours.