if williams & flybird cooperation, they will make the best drive motor?
Both of them are make flywheel store syster but in different way--mechanic & electric.
both of them put the flywheel in a vacum box, & have their own technology.
flybrid have the bearing which can keep seal up with a out put shaft rotate under 60000rpm.
Williams have Magnetically Loaded Composite to keep the motor high efficiency & lighter, williams also use this on their wheel motor, not only flywheel battery.
if we combine this 2 together, that means we will have a motor in vacum & have MLC, and it might be the lessest resistance motor (include bearing friction, air friction & magnetic vortexin) the world.