Williams FW31

The Williams FW31 was a Formula One motor racing car, designed and built by Williams F1. The AT&T Williams team used the FW31 to compete in the 2009 Formula One season. The car was unveiled on 19 January 2009 at the Autódromo Internacional do Algarve circuit in southern Portugal, and was first driven by the team's test driver Nico Hülkenberg. It was a mid-field runner, in contention for points on many occasions when driven by Rosberg, but rarely contending for podiums. Rosberg could have finished in third position at Marina Bay during the 2009 Singapore Grand Prix if he had not run wide on the exit of the pit lane and received a penalty.
Rosberg was criticised for failing to achieve a pole position while topping the times in practices on numerous occasions, notably at the 2009 Brazilian Grand Prix - the Williams cars had excelled during practice sessions in wet conditions, but did not produce the same level of performance in qualifying. While Rosberg often scored points, and elevated the car to a finishing position that it was considered incapable of, Nakajima failed to score a point all season and possibly cost the team a higher position in the championship standings than the seventh place they eventually achieved.
The Williams FW31 was the first British F1 car to use Esso-branded fuel since 1973, as well as the first Williams F1 car to use Mobil 1 lubricants since 1988 season, as they had been using ExxonMobil brands since 1999.
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== Diffuser controversy ==
At the first race of the season, an official complaint was launched by other teams against the rear diffusers of the Williams FW31, Toyota TF109 and the Brawn BGP 001 saying that they were illegal, Official Complaint against Diffusers but after analysing the cars, the FIA reported that the cars were not illegal. The teams appealed and after much deliberating the car were deemed legal by the FIA.FIA deem diffusers legal BBC Sport. 2009-04-15. 2009-04-15
==Season review==
The Williams FW31 was a slight improvement compared to previous FW28-30 cars as the team tried to get used to the major new rules in 2009. Rosberg proved to be a consistent challenger for points, though he could not clinch a podium finish. It could have been a 2nd consecutive podium finish in Singapore for Rosberg, who was running 3rd before a pit-stop. After the pit-stop, his car ran wide, causing a drive through penalty. The safety car was sent out on track, and he could not serve his penalty until the safety car was called in, ending his chances of a podium finish.
==Gallery==
File:Nico Rosberg 2009 Germany 2.jpg|Nico Rosberg at the 2009 German Grand Prix, July 2009
File:Nakajima Williams FW31.jpg|Kazuki Nakajima during Spanish Grand Prix Qualifying, 9 May 2009
File:Nico Rosberg 2009 Turkey 2.jpg|Nico Rosberg at the 2009 Turkish Grand Prix, June 2009
File:Kazuki Nakajima 2009 China.jpg|Kazuki Nakajima in the wet at the 2009 Chinese Grand Prix, 19 April 2009
File:Williams duo 2009 Japan.jpg|Nico Rosberg and Kazuki Nakajima at 2009 Japanese Grand Prix, 4 October 2009
File:Williams FW31 in garage.JPG|Mechanic working on Nico Rosberg's Williams FW31 during practices on Friday of 2009 Turkish Grand Prix
File:Williams FW31 front wings.JPG|Front wings outside Williams garage between two 2009 Turkish Grand Prix Friday practice sessions
File:Williams FW31 Australia practice.jpg|The Williams team practice pit stops during Australian Grand Prix Friday Practice, 27 March 2009
File:Button Rosberg 2009 British GP.jpg|Nico Rosberg and Jenson Button at the 2009 British Grand Prix, Silverstone, 21 June 2009
==Complete Formula One Results==
Year	Driver 	Tyre 	1 	2 	3 	4 	5 	6 	7 	8 	9 	10 	11 	12 	13 	14 	15	16 	17
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	Nico Rosberg 	rowspan="2"	 	Race stopped after 31 of 56 laps. Half points awarded.	15th	9th 	 	 	 	 	 	 	 	8th 	16th	11th	 	 	9th
 	Kazuki Nakajima	 	12th	 	 	13th	15th†	12th	11th	12th	9th	18th†	13th	10th	9th 	15th	 	13th	
Category:Cars
Category:Williams Cars
Category:2009 Cars
Category:Williams F1