DUCTED FAN, MULTICOPTER, VERTICAL TAKE-OFF AND LANDING AIRCRAFT, CPU-COOLING FAN, AND RADIATOR-COOLING FAN

摘要

[Object] To maximize static thrust of a ducted fan.;[Solving Means] This ducted fan 1 includes a duct 10, a fan 20, a motor 30, a housing 40, and stators 50. The fan 20 includes a hub 21 disposed concentric with the duct 10 and four blades 22 arranged at equal intervals on the outer circumference of the hub 21. A chord length CL of the blade 22 gradually decreases toward a tip 22A from the root. In contrast, the chord length CL of the blade 22 increases to the tip 21B from a tip vicinity portion 22B.