[DrJosiah]

Awesome design, makes me want to put one together just to see it work. :)

One concern: I saw some designs with the rotor outside the stator, physically mounted to a wheel. I'm not a mechanical engineer, but as a guy who considers himself not quite dumb enough to fail at everything...

I hope they build those motors tough. Typical electric motor mounts create a situation where the only real stresses on the motor are rotational, along the axis of rotation, or in the case of a pulley / gear-mount setup, you are usually limited to 1-2 additional push/pull axis. But on a wheel? That wheel is going to want to rotate and move on all axis, which now needs to be supported by a motor, which also includes permanent electric magnets.

Awesome lighter motor, awesome that we can sandwich the rotor between stators (more layers more torque!).