Williams FW35

The car was launched on 19 February at the Circuit de Catalunya in Barcelona, Spain, with the team using an interim version of the FW34 for the first test in Jerez de la Frontera.{{cite news|title=Williams to run 2012 car at first test|url=http://www.f1fanatic.co.uk/2013/01/18/williams-run-2012-car-test/|first=Keith|last=Collantine|work=F1 Fanatic|publisher=Keith Collantine|date=18 January 2012|access-date=29 January 2013}} This was also the team's last season using a Renault engine before a new long term deal with Mercedes was activated for 2014.

The FW35 was faced with a difficult debut when the Fédération Internationale de l'Automobile declared its exhaust system to be illegal the day the car was launched, forcing the team to revise design.{{cite news|title=Williams and Caterham exhaust designs deemed 'illegal'|url=https://www.bbc.co.uk/sport/0/formula1/21508634|first=Andrew|last=Benson|work=BBC F1|publisher=BBC|date=19 February 2013|access-date=17 March 2013}} Despite this setback, Pastor Maldonado and Valtteri Bottas declared themselves to be happy with the development of the car after completing its winter testing programme.{{cite news|title=Maldonado says FW35 is "the best car I've had"|url=http://www.f1fanatic.co.uk/2013/02/20/maldonado-fw35-car/|first=Keith|last=Collantine|work=F1 Fanatic|publisher=Keith Collantine|date=20 February 2013|access-date=17 March 2013}}

File:17 Bottas (9186363448).jpg

However, the scheduled updates that the team introduced for the first race in Australia did not work as planned, with Maldonado declaring the car to be "undriveable", and that the team had set themselves back three years,{{cite news|title=Maldonado: Williams car is undriveable|url=http://www.autosport.com/news/report.php/id/106074/|work=Autosport.com|publisher=Haymarket Publications|date=16 March 2013|access-date=17 March 2013}} though he did acknowledge that his struggles with the car may have been down to a combination of the characteristics of the Melbourne Grand Prix Circuit and the team's inability to find a proper car setup for the extreme conditions experienced over the race weekend.{{cite news|title=Maldonado: Williams are "back to three years ago"|url=http://www.f1fanatic.co.uk/2013/03/16/maldonado-williams-years/|first=Keith|last=Collantine|work=F1 Fanatic|publisher=Haymarket Publications|date=16 March 2013|access-date=17 March 2013}} Nevertheless, the team made the decision to revert the FW35 back to its launch specification before the race.{{cite news|title=Williams set to return to launch spec|url=http://www.autosport.com/news/report.php/id/106085/|work=Autosport.com|publisher=Haymarket Publications|date=16 March 2013|access-date=17 March 2013}}

2013 was a massive disaster for the team, similar to 2011. The team was eliminated in Q1 mostly along with Marussia and Caterham, and failed to score a point until Hungary, when Maldonado finished 10th. Bottas, on the other hand, qualified an impressive third in Canada, but could only finish 14th, and he failed to score a point until Austin, when he finished 8th. The team finished 9th in the Constructors’ Championship, with 5 points, their equal-worst season.

The livery are almost identical to the previous season with a subtle changes. PDVSA was retained for the third and final year until Maldonado moved to Lotus the following season. As Bottas joined the team, he brought the Finnish welding equipment company Kemppi.

At the German Grand Prix, Williams celebrated their 600th Grand Prix entries; the logo was present on the sidepods.

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(key) (results in bold indicate pole position; results in italics indicate fastest lap)

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• [http://www.williamsf1.com/portal#race-team The official Williams F1 website] {{Webarchive|url=https://web.archive.org/web/20120909014231/http://www.williamsf1.com/portal#race-team |date=2012-09-09 }}

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Category:Williams Formula One cars