The two counter rotating crankshafts share the same combustion chamber, so the engine casing remains free of any reaction torque even at extreme changes of revs and load.
It is better to have no torque at all, than to have to offset the torque from rotor / engine.
And the rider has pleasant things to do than struggling to keep his flying vehicle stable.
When a child begins riding a bicycle, it progressively learns how to react properly to the signals from the eyes and the body (i.e. on how to keep the control).
Just like driving a bike, the eyes / body of Libellula's rider are the sensors and the control system: he can soon discover the way to react properly and to keep the control.
In a Portable-Flyer it is better to use the body of the rider as the main sensing and controlling equipment, than developing and paying and carrying stabilizing and flight management systems.
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Time will prove whether flying with Libellula is more difficult than riding a bicycle.
