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World's First Bi-Rotor Ducted Drone Looks Like a Flying Donut Made for GPS-Denied Areas - autoevolution
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
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Amazon.com: QF2827-70mm Ducted Fan 12 Blades EDF with 2827 KV1800 60A Brushless ESC for RC Drone Airplane : Toys & Games
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