Robert Kubica feels Williams has two ‘completely different’ cars

Robert Kubica has suggested that Williams has to understand the reasons why the same set-up on both its Formula 1 cars is producing different results.

Williams has struggled for performance in Formula 1 this season with its recalcitrant FW42, but Kubica sustained floor damage early in the Australian Grand Prix weekend that compromised his prospects.

Kubica and George Russell also ran different set-ups in Australia but in Bahrain used the same set-up during practice.

Kubica was encouraged by the lessons Williams was able to learn but also perplexed by the issue that it has uncovered.

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"The car characteristic with the same set-up is completely different,” he said.

"I had some doubt after Australia, honestly I thought it [the feeling] was caused by floor damages, [but] the floor is in good state here.

"And still even we are using the same baseline set-up as the other car and we have different characteristics and it’s quite significant, something within the aero which is upsetting a lot the handling of the car and general grip of the car.

"We have to wait and see and try to find the answers.”

He added: "In Australia I was struggling, here I am struggling. We thought maybe we went wrong direction with the set-up in Australia so that’s the reason we started with the same baseline set-up as George.

"We can see there’s completely different aero characteristics within two cars so now we have to understand the reasons.

"It’s definitely not helping, it’s quite big, it’s like driving a completely different car."

Kubica finished the second practice session at the rear of the 20-driver field, a second behind team-mate Russell, who placed 19th.