![Quadrotor Wheel Can Fly, Float, and Roll](https://hight3ch.com/wp-content/uploads/2013/11/multi-purpose-flying-robot.jpg)
This is a quadrotor surrounded by a circular piece of foam that makes it capable of (among many other things) balancing itself sideways like a wheel and rolling along the ground.
Via IEEE
This is a quadrotor surrounded by a circular piece of foam that makes it capable of (among many other things) balancing itself sideways like a wheel and rolling along the ground.
Via IEEE