Felipe Massa admits his Williams team is still trying to figure out why its car loses a vast chunk of performance to its rivals in the wet after struggling when the rain fell at the end of the British grand prix.

Both Massa and his team-mate Valtteri Bottas looked like strong contenders for rostrum finishes at Silverstone after enjoying excellent getaways off the grid to jump ahead of Mercedes duo Lewis Hamilton and Nico Rosberg.

However, as the race progressed both drivers struggled with tyre deterioration and when the rain fell during the final few laps Williams saw a huge drop in pace and fell out of the podium positions to finish fourth and fifth respectively.

Related Articles

"For sure we have a problem. Since two years ago we are trying to understand why we are not quick in the rain, which is not nice," Massa confirmed after the race. "We have a problem, if you see the difference in lap times we were maybe fighting with Mercedes, they were 0.1 or 0.2s quicker than us in free air, not more than that. In the rain we were maybe two seconds."

The Brazilian adds it is an issue the British team has been trying to solve since he switched from Ferrari to Williams 18 months ago and feels they've made little progress in that time.

"We have been trying to understand it for two years! I don't know," he said. "If you see our car this year is like an evolution of the car from last year. Last year was very bad in the rain and this year also, so we don't know yet.

"We have been trying to analyse it for a long time but we didn't find out yet. We just lose a lot of grip, it looks like something is going on, something is happening."