Red Bull's RB8, the car with which it will bid to extend its championship-winning run, took to the track for the first time at midday at Jerez. Mark Webber completed a single installation lap before returning to the pits.
The Australian is scheduled to drive the car for the first two days, before handing over to the reigning World Champion Sebastian Vettel for the final two days.
Although Red Bull officially unveiled the RB8 on Monday it had been kept largely under wraps at Jerez until Webber's opening run. Ferrari, Lotus, Toro Rosso and Force India had all completed more than 30 laps by the time Webber went out.
The car appears outwardly similar to last year's all-conquering RB7, but features a revised nose layout and a different exhaust to accommodate this season's rule changes.