Williams has released images of its new Cosworth-powered FW33 2011 challenger which is set to join several other new cars when testing begins in Valencia today.
The car, painted in the team's traditional navy blue interim testing colors, follows this year's trend of high noses, detailed airboxes and sculpted sidepods.
Rubens Barrichello will give the car its initial run today and will share the running with rookie and GP2 champion Pastor Maldonado on Wednesday, before the Venezuelan takes over duties for the final day.