Daniel Ricciardo says Red Bull is taking responsibility for its own failings with this year's car, claiming the current deficit to the leading teams is not just down to engine supplier Renault.

Red Bull's tough start to the 2015 season has been much discussed during the early rounds of the season, with blame primarily targeted towards Renault as it struggles to provide a competitive and reliable power unit.

However, after all four Renault-powered cars reached the end of the Spanish Grand Prix, attention is turning towards bringing the chassis up to speed, with Ricciardo admitting there is now acceptance in the team that the RB11 has its own shortcomings contributing to the lacklustre form.

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"I think we knew even before Spain but I think that highlighted it's not only engine," he said. "I think everyone's obviously now aware of that and putting their hands up as well and saying 'Yeah, we know, it's not where it should be'.

"Obviously the last four or five years for Red Bull, one standout was the downforce and particularly high-speed corners. Even last year we were always pretty strong in high-speed. I thought it was our strength as a team. This year we're not better than anyone in high-speed, if anything I think we're even slower than the top guys in high-speed corners.

"So that's just one area where for whatever reason we haven't taken our normal step forward and the other teams have. We're losing out in a few places, as I said everyone in the team knows now, it's just trying to figure out why and how to fix it. But it's not just Renault."

Ricciardo's best result from the opening four rounds of the season is a sixth place in Australia and China.