
Volvo Builds a Different Kind of Hybrid
• popularmechanics.comEverything in the Volvo KERS system is built around the flywheel, but it’s not just a lump of round metal. It’s a wound carbon fiber shell over a lightweight aluminum core totaling 13.2 lbs and precisely balanced. This construction is optimized to prevent the structure from stretching outward due to centripetal force—important because this thing is designed to spin up to an unfathomable 60,000 rpm.