Red Bull Racing's reserve driver Sebastien Buemi got his first taste of the latest generation of Formula 1 car during testing at the Circuit de Catalunya, even if both his and the team's day would be interrupted by a gearbox failure.

The Swiss driver, who started 55 F1 races between 2009 and 2011 for Scuderia Toro Rosso, jumped into the Red Bull RB10 for the first time in Spain to help develop the progress made by race drivers Daniel Ricciardo and Sebastian Vettel during the Spanish Grand Prix.

However, on the day hampered by intermittent rain, Buemi's efforts would be halted after 54 laps when the car ground to a halt with a gearbox problem.

Related Articles

With a fairly unique perspective to test the RB10 several months into its development cycle, though Buemi admits the car is 'completely different', he nonetheless quickly felt comfortable.

"It was my first day in the RB10 with the new engine and powertrain. I experienced a bit of wet and a bit of dry, so we mainly concentrated on trying to understand the car better after the weekend and trying to work on it.

We had a gearbox issue, so we will look into it for tomorrow what we have to fix, but it was definitely a good day for us even if we wanted to do some more laps.

"[The car] It is completely different to last year. You can see on the lap times it is slower, but inside the car it is a very big difference. When you are used to the grip of last year, you don't really believe it in the first few laps. You get used to it quickly though and we could see that the Pirelli tyres were perhaps a bit conservative, but we had enough laps to get a good feel."

With Vettel stepping into the car tomorrow, Buemi - who heads up Toyota's efforts in the World Endurance Championship - maintains the day was important despite the early end.

"We can't look too much into the details because we didn't look into performance. The main objective was mainly correlation and aero works. We did a lot of laps through the pit lane trying to change small things. "