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Austrian Formula One (F1) team Red Bull launches its new car, the RB9, at its Milton Keynes base in the UK.
"If I'm honest, [developing the RB8] has compromised the timescales of the new car more than we would have liked," said the team's chief technical officer Adrian Newey. "It was the right trade at the time because we managed to get the job done but it means a busy winter trying to catch up again," he added.
The new race car will be ready for pre-season testing, which begins in Jerez on February 5.
Red Bull will be going for a fourth consecutive drivers' and constructors' championship double this season. It has retained the driver line-up of Sebastian Vettel and Mark Webber.