Slipstream

Slipstream is a racing technique where a driver follows closely behind another vehicle to reduce wind resistance and gain speed by taking advantage of the disturbed air in the lead car's wake.

When a car moves at high speed, it pushes air out of the way, creating a low-pressure area or "bubble" of disturbed air directly behind it. A following car can move into this area where there's less air resistance, allowing it to travel faster while using less engine power. Think of it like walking behind someone in a strong headwind – it's much easier because they're blocking the wind for you.

Drivers use slipstreaming primarily for overtaking. By following in another car's slipstream, they can close the gap and build up extra speed. When the right moment comes, they can pull out of the slipstream and use that accumulated speed advantage to pass the lead vehicle. This move is sometimes called a "slingshot pass" because of how the trailing car seems to catapult forward.

The technique is especially common in NASCAR, where drivers line up bumper-to-bumper on long straightaways to maximize the drafting effect. In Formula 1, drivers use slipstreaming on tracks with long straight sections to set up overtaking opportunities. MotoGP riders also draft behind each other to reduce drag and gain crucial speed advantages.

Slipstreaming isn't just about going faster – it also helps conserve fuel since the engine doesn't have to work as hard to maintain speed. In some racing series, teammates work together to create effective slipstreams, taking turns leading to help each other achieve better lap times.

The effectiveness of slipstreaming depends on several factors including the speed of both vehicles, track conditions, and wind direction. Generally, the effect is most noticeable at higher speeds and becomes less effective with more aerodynamically advanced cars that already cut through the air efficiently.