Radial friction could also be considered driving friction, as it is the friction involved when the wheel is being driven forward and reverse. Or, it can be applied when the wheel is stationary and it is resisting a force from the front or back.
Transverse Friction is the ability of the wheel to move sideways, or scrub. This is also the friction involved when the wheel is stationary and a force from the side is applied to it.
Static friction is involved when the wheel just begins to move from a stationary position. Dynamic friction is involved when the wheel is already moving.
The new Aluminum Omni-Wheels have the same roller geometry and setup as the Plastic Omni-Wheels.
These tests were made on FRC-type carpet, with 30 lbs. of downforce on each wheel. The omni wheels were tested individually, while the Mecanums were tested in a right and left pair, with 60 lbs. of downforce.
Ignore that. They sent out a message to all teams at the start of the 2006 season, and they reported the findings of their tests of several of their backing material on the carpet, diamond plate, and ramp… Its in the white paper’s section somewhere. That message aside, I don’t think I have ever seen anything grip better than the green brecoflex treads.