I’ve got an electric car design that doesn’t require any rare earth minerals or precious metals for batteries at all!
We’ll just put a giant flywheel in the trunk to store all the energy. Now the steering might be affected a bit, but that’s a small price to pay for “going green”!
Back in the 80s at Allison we built a bus drivetrain with the flywheel concept. It was set up to use braking energy to charge the flywheel. Since the flywheel has to be in a vacuum and magnetic bearings to minimize the drag, it was too big of a technical challenge (and $$$) for road vehicle equipment.
They were doing that back in the 40s in buses. And more modern adaptations, too.
Or go real old school, Flintstone cars.yaba daba do.😏
Axis direction and gimbals need to given some thought.