page_title: 2009 Formula One World Championship
section_title: Rule changes
hierarchical_section_title: 2009 Formula One World Championship / Rule changes
caption_attribution_description: English: Sebastian Vettel in the Red Bull RB5, F1 testing session, Jerez 10-Feb-2009
context_page_description: The 2009 FIA Formula One World Championship was the 63rd season of FIA Formula One motor racing. It featured the 60th Formula One World Championship which was contested over 17 events commencing with the Australian Grand Prix on 29 March and ending with the inaugural Abu Dhabi Grand Prix on 1 November.
  Jenson Button and Brawn GP secured the Drivers' Championship and Constructors' Championship titles respectively in the Brazilian Grand Prix, the penultimate race of the season. It was both Button and Brawn's first Championship success, Brawn becoming the first team to win the Constructors' Championship in their debut season. Button was the tenth British driver to win the championship, and following Lewis Hamilton's success in 2008 it was the first time the Championship had been won by English drivers in consecutive seasons, and the first time since Graham Hill and Jackie Stewart that consecutive championships have been won by British drivers. Also notable was the success of Red Bull Racing, as well as the poor performance of McLaren and Ferrari compared to the previous season.
context_section_description: The FIA released preliminary technical regulations for the 2009 season on 22 December 2006, and were revised several times to accommodate the findings of the Overtaking Working Group (formed in response to concerns that passing in wheel-to-wheel racing was becoming increasingly rare) and the increasing need for cost-cutting in the sport in the wake of the economic crisis.
  Slick tyres returned for the first time since they were banned for the 1998 season. Bridgestone continued to be the sole supplier of tyres, and drivers still had to use both compounds of tyre during a race. Soft tyres were differentiated by a green marking around the sides of the tyres, rather than a white marking in a groove as used in 2008. Further, wet tyres were renamed "intermediate" and extreme-weather tyres were renamed "wet".
  The aerodynamic regulations were radically altered for the 2009 season. The front wings were made lower and wider, while rear wings were changed to be higher and narrower. As well as the changes in the dimensions of the wings, bodywork became much more regulated with many of the additional components seen in previous seasons (including barge boards, winglets and turning vanes) removed, making 2009 cars noticeably different in appearance than in previous years. The diffuser at the rear of the car was moved back and upwards. Many other minor chassis components were also standardised. The aim of the new aerodynamic regulations, as well as the reintroduction of slick tyres, was to decrease reliance on aerodynamic downforce and increase mechanical grip with the aim of making wheel-to-wheel racing easier.
  For the first time, cars were allowed to use driver adjustable bodywork, in the form of adjustable flaps in the front wing. The flaps could be adjusted by up to six degrees, limited to only two adjustments per lap. Adjustable front wings were designed to improve downforce when following another car, another change designed to improve overtaking.
  Kinetic Energy Recovery Systems, a regenerative braking device designed to recover some of the vehicle's kinetic energy normally dissipated as heat during braking, were introduced for the 2009 season. The recovered energy can be stored electrically, in a battery or supercapacitor, or mechanically, in a flywheel, for use as a source of additional accelerative power at the driver's discretion by way of a boost button on the steering wheel. The regulations limit the additional power to around 82 hp (61 kW) of 400kJ for six seconds a lap. The systems were not made compulsory, and because of concerns about both limited performance gains and safety implications only four teams opted to use the system during the season.
  While the FIA were planning on introducing a budget cap to limit the amount of spending by Formula One teams in 2008, the amount was not agreed upon and the budget cap idea was dropped. Instead, costs were brought down by a complete ban on in-season testing, a forced reduction in wind tunnel usage, the sharing of more data during race weekends, an increased minimum engine lifespan and gearboxes had to last for four races, and a penalty of five places in the starting grid was applied, should a driver change it during the weekend before the start of the race.
  Each driver was limited to a maximum of eight engines throughout the season, in addition to four engines for practice/testing purposes; using additional engines resulted in a 10-place grid penalty for each additional engine used. To aid improvements in reliability, the engines were detuned from 19,000 RPM to 18,000 rpm.
  The rule stating that the pit lane is closed during a Safety Car period was scrapped in 2009. The rule was introduced in 2007 to prevent drivers rushing back to the pits to refuel, possibly speeding through a danger zone, but software was successfully developed to solve this problem. The pit lane speed limit was also increased from 50 mph (80 km/h) to 62 mph (100 km/h).
  The FIA initially declared that the driver with the most wins at the end of the season would be the winner of the 2009 Formula One World Champ
caption: The front wing was lower and wider than in 2008.
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