Description:The Red Bull Formula One team on Sunday (February 3) unveiled an "evolutionary" RB9 car with which they hope to top the championships for a fourth consecutive year, while champion driver Sebastian Vettel said past successes did not give the team "a head start or any advantage". Launched at the Red Bull F1 factory in Milton Kenyes in central England, the RB9 is a clear evolution from last year's model, but with notable design tweaks.(1:58)