![]() It could also boost drones’ ability to assist missions such as searching for lost hikers. If so, it would give drone operators more time to take money-making photos and video in flight. That may be able to enable longer flight times. Commercial drone manufacturers have begun working on aerodynamic optimization, using techniques such as wind tunnel testing and computational fluid dynamics originally developed for analysis and design of full-scale aircraft and helicopters. This is a case where technologies from aircraft and helicopter aerodynamics will find their way to the smaller vehicles. That in turn allows a smaller battery to be carried, which means lighter weight and greater maneuverability. Reducing the drag force means a drone needs less power to fly at high speed. A rectangular block has a drag coefficient of roughly 1, while a carefully streamlined body with about the same proportions has a drag coefficient of about 0.05. Aerodynamically, the multi-rotor drones that are used for racing are not sophisticated: A racing drone is essentially a brick (the battery and flight electronics) with four rotors attached. ![]()
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