How to Cut a Car's Air Drag: More Air?

When you think of an aerodynamic car, what comes to mind? Smooth curves, sharp points, images of smoke streaming over surfaces in a wind tunnel--but what if we didn't have to change something's shape to help it cut through the air more efficiently? That's the idea behind a new experiment reported in Physical Review Fluids, in which scientists showed that adding nozzles which shoot precisely timed jets of air can substantially cut a vehicle's drag profile, potentially improving efficiency and gas...