1 working wheel is enough for balancing. they can be as simple as just a motor in rubber. it's more likely tail or wing will fail than both motors BTW, here is

1 working wheel is enough for balancing. they can be as simple as just a motor in rubber. it's more likely tail or wing will fail than both motors BTW, here is how it works from Boston Dynamics, it can jump: https://www.youtube.com/watch?v=LHJKGgwpWY8 https://www.youtube.com/watch?v=LHJKGgwpWY8