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Last year Williams retained its pace relative to Mercedes, but Ferrari and increasingly Red Bull stepped into the gap between them.
The low drag, high top speed ethos of 2014's FW36 was carried over, but the old car's stable mechanical package appeared to lose its edge. The FW37 struggled in the wet and on low speed corners, while on other occasions appeared to inexplicably fail to get the tyres in their working range.
With these problems well understood, winter development aimed to resolve the issues and add pace to the new package.
