Annular ring wing Vario Copter
The asymmetric reduction in the area of the oval wing maintains zero wingtip induced drag (37% of total drag), but reduces its lift. It is over-compensated by the wing's lower self-mass and lower skin friction drag, due to its reduced wing surface area and dimples (similar to the dimples on golf balls) on its underside. We obtained such definitive results from laboratory measurements on wind and hydrokinetic turbines with similar elliptical blades
Drones have gained popularity because of the suitability for a broad range of applications. Drones are Unmanned Aerial Vehicles (UAV) and may be used for aerial photography, product deliveries, military operations, agriculture, policing and surveillance, infrastructure inspections, and science. The design variation among drones is vast and may be categorized according to configuration, engine type and operational role. For example, the configuration of drones may be fixed winged, blended wing-body designs or flapping-wing ornithopters. The engine design may be internal combustion, jet engine, rotary engines, piston engines or electric engines. Small drones mostly use lithium-polymer batteries while some larger drones use hydrogen fuel cells. The design of the drone may enable it to be used as a base station for providing wireless communication to subscribers or user equipment. Annular winged DRONE is a world patent novelty, according to the official patent statement, which you can download from HERE The patented VarioCopter™ takes-off and lands vertically. With the same propeller motors, flies horizontally as a winged aircraft, This is the most economical aerodynamic scheme that provides the most energy-efficient flying in all flight modes. Because the wing has no periphery - there is no any peripheral vortex air drag and therefore it has zero energy losses. At the same time, it has all the advantages of conventional drones
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Inventors and patent holders
George Tonchev, Veselin Vassilev. Alexander Lupov.