M4 | The Bioinspired Robot Exhibits Flight, Rolling, Walking, and Additional Capabilities

The new robot M4 can roll on four wheels, turn its wheels into rotors and fly, stand on two wheels like a meerkat to peer over obstacles, "walk" by using its wheels like feet, use two rotors to help it roll up steep slopes on two wheels, tumble, and more.

A robot with such a broad set of capabilities would have applications ranging from the transport of injured people to a hospital to the exploration of other planets. Watch on YouTube

The robot's flexibility of motion, coupled with artificial intelligence, allows it to choose what form of locomotion will be most effective based on the terrain ahead of it. Picture the M4 exploring an unfamiliar environment: it might start by rolling along on four wheels, which is its most energy-efficient mode. Upon reaching an obstacle like a boulder, it could stand on two wheels to peer over it for a clearer picture of the ground ahead. Then, if it saw a ravine or another feature that a wheeled robot could not traverse, it could reconfigure its wheels into rotors, fly over the ravine to the other side, and resume rolling along.

One of the key features of M4 is its ability to repurpose its appendages to wheels, legs, or thrusters. When M4 needs to stand up on two wheels, two of its four wheels fold up and their inset propellors spin upwards, providing balance for the robot. When M4 needs to fly, all four wheels fold up, and the propellors lift the robot off the ground.

Joints on the wheel assemblies allow M4 to execute a walking motion. In M4's current iteration, the walking motion is mostly proof of concept. However, with anticipated advances, future M4 generations could possess the ability to effectively walk across broken terrain that a wheeled robot would struggle with.

M4 has been equipped with autonomous capabilities and can make decisions for itself about how best to navigate through a complex environment. The robot has also been tested outdoors and has navigated the terrain of Caltech's campus.

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