Boeing patents drone recharge system that employs a retractable tether reaching from the drone to the recharging ground station. http://www.businessinsider.com/boeing-patent-mid-air-rechargeable-drones-2015-6
Boeing patents drone recharge system that employs a retractable tether reaching from the drone to the recharging ground station. http://www.businessinsider.com/boeing-patent-mid-air-rechargeable-drones-2015-6