By BBC Sport’s Andrew Benson
**Red Bull have revealed the new car they hope will enable them to go one better than their second-place finish in last year’s world championship.**Race drivers Sebastian Vettel and Mark Webber unveiled the car at the start of this week’s testing in Spain.
The Renault-powered RB6 will take to the track in Jerez on Wednesday alongside all the other major teams, who have already unveiled their cars.
The test, which will provide clues to 2010 form, runs until Saturday.
Red Bull’s 2010 car is an evolution of last year’s model, with several detail changes.
The scooped-out, ‘scalloping’ on the top of the chassis - aimed at improving airflow - is more pronounced, there is an intricately detailed front wing and a ‘shark-fin’ engine cover similar to those that have appeared on a number of other cars.
Some of the biggest changes are at the rear of the car, including the abandonment of last year’s innovative ‘pull-rod’ rear suspension system to allow the team to fully optimise the car’s ‘double diffuser’.
Last year’s Red Bull was conceived without one of these diffusers, which caused huge controversy when they were used by the Brawn, Williams and Toyota teams at the start of last season at a time when their rivals felt they were illegal.
After governing body the FIA declared them legal, all the other teams had to come up with their own version.
But Red Bull, among others, were never able to fully exploit the design’s ability to create aerodynamic downforce because of other parts of the car.
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Those teams - Ferrari are another - have now been able to put that right with their 2010 cars.
All the established teams will be at this week’s test, with Force India, who were not in Valencia last week, joining Ferrari, McLaren, Mercedes, Renault, Sauber and Williams.
The new Virgin team will also be there, becoming the first of the 2010 start-up outfits to go head-to-head with the experienced runners.
That means only Lotus, who ran their car for the first time at Silverstone on Tuesday and are having an official launch in London on Friday, US F1 and Campos will not be in Jerez.
Red Bull finished the 2009 season with the fastest car, with Vettel and Webber winning the final three races of the year, so their new car’s pace will be watched with interest.
The RB6 will also be analysed for design innovations conjured up by the engineering team led by Red Bull’s chief technical officer Adrian Newey, who is regarded as the greatest motor racing designer.
Ferrari were the pace-setters at the opening test in Valencia last week, with drivers Felipe Massa and Fernando Alonso recording the fastest times on all three days.
The top teams are splitting their drivers over the four days.
Alonso will drive for Ferrari on Wednesday and Thursday, with Felipe Massa taking over for Friday and Saturday.
World champion Jenson Button will drive for McLaren on the first two days of the test, with Lewis Hamilton taking over for the final two.
Mercedes will have Nico Rosberg driving on Wednesday and Friday, with Michael Schumacher in the car on Thursday and Saturday.