Ducted Fan Quad Copter by InlineTwin - Thingiverse | Drone design, Drones concept, Drone technology
HD1-VS Ducted 5" Built & Tuned Drone - 6S | Store credit cards, Building, Support team
Can we make a quad-copter with a ducted fan and make it perform basic functions? What is good for a quad-copter, ducted or just normal propellers? Why? - Quora