A design for a ‘helical air screw', a helicopter-type flying machine, from the notebooks of Leonardo da Vinci. To avoid anyone reading his notes, Leonardo wrote in a shorthand of his own devising or, as here, using mirror writing

Самолёты на фотографии: Aircrafts on the photo: Leonardo da Vinci вертолет - ИталияItaly - 1489

SkyDrive unveiled the SD-03 'flying car' with quadcopters at CES in Las Vegas in January 2022

Самолёты на фотографии: Aircrafts on the photo: SkyDrive SD-03 - ЯпонияJapan - 2020

SkyDrive's SkyLift quadcopter is capable of carrying up to 30kg on each flight

Самолёты на фотографии: Aircrafts on the photo: SkyDrive SkyLift - ЯпонияJapan - 2018