Carl Bugeja | Ball Folding Propeller! @CarlBugeja | Uploaded March 2018 | Updated October 2024, 5 hours ago.
This is my 3d-printed propeller that folds into a compact 16mm diameter semi-sphere. When rotated the two blades open up automatically by the centrifugal force. The blades will then fold back into the semi-sphere once the motor is stopped.

Follow me on Twitter: twitter.com/BugejaCarl

More info about this project: hackaday.io/project/93648-spherical-folding-propeller