Crazy as it sounds, da Vinci Flight Spiral is actually flying!
https://youtu.be/YsG-Mcn29kg

‘Crimson Spin’ brings da Vinci helicopter design to life, Vertical Oct 12, 2022
Article by Ben Forrest
Austin Prete image
https://verticalmag.com/features/crimson-spin-brings-da-vinci-helicopte…

Bet that Leonardo himself would be proud!
https://de.wikipedia.org/wiki/Leonardo_da_Vinci#/media/Datei:Macchina_v…