Audi test their new R18 e-tron quattro Hybrid Race Car - in pictures

The R18 e-tron quattro is based on the team's Le Mans-winning R18 from 2011 but features a flywheel developed by Williams F1 that during braking captures kinetic energy from the front axle Photograph: Richard White The energy is then retrieved from the flywheel under acceleration at speeds above 75 mph Photograph: Richard White The e-tron earns the quattro label because its hybrid drive adds power to the front axle Photograph: Richard White The car is powered by a 510-hp 3.7L V6 TDI diesel engine Photograph: Richard White The Sebring winning trio of Allan NcNish, Tom Kristensen and Dindo Capello will race an e-tron quattro at this year's Le Mans 24 hours Photograph: Richard White