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
Aerodynamic performance assessment of a ducted fan UAV for VTOL applications - ScienceDirect
Amazon.com: XUXUWA RC Drone Brushless Motor Fan 70mm 12 Ducted Fan 4S Drive EDF for RC Drone Brushless Motor Quadcopter Accessories : Industrial & Scientific
PDF] Development of a dynamic model of a ducted fan VTOL UAV | Semantic Scholar