Red Bull Racing's Daniel Ricciardo says he is encouraged by his new RB11 following the first day of F1 testing in Jerez, despite niggling issues limiting track time.

Resplendent in a special camouflage livery which will be used during testing, the RB11 broke cover for the first time as it exited the pit garage for the first day of testing and began fairly strongly.

Indeed, the Australian enjoyed bursts of pace over the course of the day, but technical issues would consign him to the pit lane for prolonged periods of time before it was decide to conclude early so the team could focus on fixing the issue for tomorrow.

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Despite completing only 36 laps, Ricciardo was still fourth fastest, seven tenths off pace setting former team-mate Sebastian Vettel, and was certain the car represented a step forward over its predecessor.

"I can't give too much away but let's say we understand what we are running here and I think it is good," he said. "We still need to refine a few things with driveability - normal things for this time of the year - but generally I think it is what we expected. I think it is a step forward, but we will see in Melbourne. For the first day it has some positive signs.

"Everything is behaving as it should, we had some issues here and there, but when the car is running it seems pretty normal. A good day one."

Ricciardo will hand over to new team-mate Daniil Kvyat for the second day of testing tomorrow.