There is a little more information in this hackaday article [1]. Both propellers have swashplates like a helicopter which allows them to control the pitch of ea

There is a little more information in this hackaday article [1]. Both propellers have swashplates like a helicopter which allows them to control the pitch of each rotor. [1] https://hackaday.com/2020/09/02/an-up-close-look-at-the-first-martian-helicopter/ https://hackaday.com/2020/09/02/an-up-close-look-at-the-firs...