Editing Auto racing (section)

===Kart racing===
[[File:AtwaterSat394.jpg|thumb|A sprint kart race in Atwater California hosted by the International Karting Federation]]

{{Main|Kart racing}}
The modern kart was invented by Art Ingels, a fabricator at the Indianapolis-car manufacturer Kurtis-Kraft, in Southern California in 1956. Ingels took a small chainsaw engine and mounted it to a simple tube-frame chassis weighing less than 100&nbsp;lb. Ingels, and everyone else who drove the kart, were startled at its performance capabilities. The sport soon blossomed in Southern California, and quickly spread around the world. Although often seen as the entry point for serious racers into the sport, [[kart racing]], or karting, can be an economical way for amateurs to try racing and is also a fully-fledged international sport in its own right. A large proportion of professional racing drivers began in karts, often from a very young age, such as [[Michael Schumacher]] and [[Fernando Alonso]]. Several former motorcycle champions have also taken up the sport, notably [[Wayne Rainey]], who was paralysed in a racing accident and now races a hand-controlled kart. As one of the cheapest ways to race, karting is seeing its popularity grow worldwide.

Despite their diminutive size, karts of the most powerful class, [[superkart]] (assuming a weight of 205&nbsp;kg (452&nbsp;lb), and a power output of 100&nbsp;hp (75&nbsp;kW)), can have a [[power-to-weight ratio]] (including the driver) of 490&nbsp;hp/tonne (0.22&nbsp;hp/lb). Without the driver, this figure doubles, to almost 980&nbsp;hp/tonne (0.44&nbsp;hp/lb).