The company has not revealed exactly how many blades it uses on its electric ducted fans, but Villa says it is “more than you would see on the turbofan of a [Boeing] 737.” The idea for an ...

Close, but not quite, since the rotor blades are fixed-pitch ... The monocopter is built around a 90-mm electric ducted fan mounted vertically on a 3D-printed shroud. The shroud serves as a ...