KERS of the hybrid car: Flywheels and ultracapacitors give you a 10-second jolt

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Flywheels or ultracapacitors and a four-cylinder engine could be enough to power even the biggest cars and SUVs. They’re like limited-duration turbochargers, good for around 10 seconds of extra power at a time, and they replace complicated hybrid electric systems with, well, differently complex electromechanical systems. Volvo is the latest automaker to announce interest in flywheel power while Porsche has been using flywheels successfully in auto racing. These flywheel cars, dubbed kinetic energy recovery system (KERS) vehicles, are another form of hybrid vehicle because they have an electric drive system supplementing the combustion engine.

http://www.extremetech.com/extreme/92794-kers-of-the-hybrid-car-flywheels-and-ultracapacitors-give-you-a-10-second-jolt