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Why don't quadcopters have a fifth, large central rotor for main uplift? Would this not be more efficient and quiet? - Quora
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Amazon.com: Contixo F22 FPV Drone with Camera for Adults, Kids, Beginners - 2.4G RC Quadcopter with 4K FHD Camera - Gesture Control, Custom Flight Path, WiFi, GPS Auto Hover Return Home, Follow
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Designed model view of drone system for 12 rotors (a) rotor directions,... | Download Scientific Diagram
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Amazon.com: Contixo F22 FPV Drone with Camera for Adults, Kids, Beginners - 2.4G RC Quadcopter with 4K FHD Camera - Gesture Control, Custom Flight Path, WiFi, GPS Auto Hover Return Home, Follow
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