Quote:
Originally Posted by RunningStrong
. So you need vacuums and magnets, all the more complicated, all the more expensive.
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Yes. A few Formula One cars used the Flybrid system for a while. Added about $100,000 to the cost of the car (and the system stored less energy than the standard Prius battery does). Flywheels have had some success in uninterruptable power supplies, but in vehicles, the weight/energy storage/cost just doesn't work.
In a vehicle, the bearings must be ultra low friction but also ultra strong to withstand the precession forces associated with handling and ride motions.