One additional point that is worth making regarding this rotational inertia in the blades is that this is what makes auto-rotation possible. In an engine-out s

One additional point that is worth making regarding this rotational inertia in the blades is that this is what makes auto-rotation possible. In an engine-out situation a helicopter has a lot of energy stored in these blades and by conserving this as much as possible while 'falling' the pilot can pull up on the cyclic when close to the ground to trade the energy for enough lift to survive the crash. A direct-drive drone propeller cannot auto-rotate, and if for some reason it has an in-flight emergency that interrupts electrical power to the VTOL rotors it will plummet like a brick. I am not sure about the glide characteristics of those wings, but with all of the drag from the non-operative drone rotors I am guessing it would be somewhere between 'awful' and 'lawn-dart'.