Slip stream definition
a racing technique in which one vehicle tucks in closely behind another (catches a tow). The total aerodynamic drag acting on the two vehicles is actually less than the drag that acts on each vehicle when they are separated by greater lengths; this allows both vehicles to gain straightaway speed . The lead vehicle cuts into the air acting as a wind break for the following vehicle, and the closeness of the second vehicle reduces the turbulence normally generated at the rear of the first vehicle. Also called drafting .