The volvo's Flywheel KERS is fitted to the rear axle. During the braking action causes the flywheel to spin at up to 60,000 rpm. The front mounted engine shuts off. the Energy stored in the spinning flywheel can then be applied via a special transmission toward acceleration or used to power the car once it reaches cruising speed.
Flywheel is a carbon fiber material made and spine in a vacuum to minimize frictional losses. its weight is 6 kg and 20 cm in diameter.
The flywheels stored energy is sufficient to power the car for a shot periods. this has a major impact on fuel consumption
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