Traditional carts are great for moving heavy loads but they are challenging to move on uneven terrains, such as stairs. The Palletrone cart from MRL is a multi-rotor flying cart for aerial cargo transportation. It has an admittance controller that alters flight trajectory when an external force is applied. The below video shows this flying cart in action:
More gadgets like this: here
The Palletrone Cart: Human-Robot Interaction-Based Aerial Cargo Transportation
As these experiments show, the Palletrone can adjust its position and orientation based on the human operator motion. It can also change altitude as required. This makes it possible to move things above stairs.
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