Mainly a completely different control mechanism and single vs multiple power-sources. On a multirotor, there are obviously 4/6/8 motor/rotor sets, typically po

Mainly a completely different control mechanism and single vs multiple power-sources. On a multirotor, there are obviously 4/6/8 motor/rotor sets, typically positioned far from the mass centroid, so control is effected by 1) varying the thrust from each rotor (primarily pitch & roll), and 2) varying the speed of each rotor for inertial effects (primarily yaw). This uses a single rotor and thrust vectoring fins to influence the direction and reaction to the thrust. I'm more interested in how the efficiency numbers work out. Typically, a larger rotor produces more thrust per unit of energy. However, a ducted fan is also typically significantly less efficient than an un-enclosed rotor. Since I don't have numbers, my question is which effect dominates -- is it overall more or less thrust efficient than a multirotor? Either way, it is a very cool design & build -- nice work Ikarus!