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The quasi-airship shape is based on an aerofoil, meaning it also provides lift like its wings do when the plane moves forward.

At such a scale, a parachute consisting of a bunch of bristles is as effective as the aerofoil found in larger seeds that disperse from taller plants — such as the winged seeds of the maple.

I found an image of Grace Kelly, this time in a blue gown so tailored that she looked like an aerofoil.

The trick is that the struts holding the front propellers are also aerofoils that provide lift during forward flight, meaning the drone combines the characteristics of a helicopter with those of a fixed-wing aircraft.

Cyclocopter aerodynamics is more like that of insects than of conventional aircraft, in that lift is generated by stirring the air into vortices rather than relying on its flow over aerofoils.