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Red Bull team principal Christian Horner says the squad is working flat out to be ready in time for this weekend's first pre-season test of the new campaign.
Horner's Red Bull squad will be present at Jerez for the four day test, which begins on Sunday, but the Briton says that the team is still working on its new Renault-powered RB11.
"Not yet," Horner said when asked if the RB11 was ready. "The car is flat out into car build at the moment, probably the shortest production and assembly time in our previous ten seasons.
"[It's] unbelievable what the factory has turned around so far, but there is still plenty of work to do before Sunday."
Horner is sure that the squad, which placed second in last year's Constructors' Championship, will enjoy a more prosperous pre-season campaign this year, after its 2014 winter period was blighted by reliability woes.
"First test last year, hopefully this one can’t be worse than that we managed four laps over four days as the car would stop or catch fire," he said.
"I think it’s been a far more positive winter compared to last year, we know where the benchmark is and what we need to achieve so as the team continues to evolve and grow, it’s been for sure the most impressive winter we’ve had as a team in terms of coming together, design hitting all their deadlines and targets."
