RC model of Zorglup’ (europe Zyklotrop) aircraft of Spirou & Fantasio: https://www.youtube.com/watch?v=0IAbTzaiQBo
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I wonder if there were already some early prototypes he could have drawn inspiration from.
Unlikely. They knew already from such devices about balancing issues. Nowadays no problem but back then they had neither the sensors nor the mobile computing power for auto-balancing.