[Bauwser] had some spare RC Helicopter parts laying around and ... A hole was cut in the body to mount a 55mm ducted fan which provides the required air to fill the skirt and lift the vehicle.

Helicopter? Close, but not quite, since the rotor blades are fixed-pitch. We’ll just go with “monocopter” for now and sort out the details later for this ducted-fan, thrust-vectored UAV.