Drive for Coaxial Propellers 27 August 2019, 19:30 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! Input is the grey shaft. Grey and blue propellers rotate in opposite directions with the same velocity. « previous mechanism Quadrupteron next mechanism » Transmission With Teeth-Uncompleted Gears a load comments Please enable JavaScript to view the comments.