Christian Horner on Thursday pinned Red Bull's hopes on the fate of its current engine supplier. For much of the season so far, the energy drink owned team's chiefs have been scathing of Renault's performance. But Red Bull has ruled out building its own engine, apparently failed to woo a Volkswagen brand to the grid, and acknowledged that key rivals Mercedes and Ferrari are not viable alternative suppliers. So in the past days, Red Bull's vitriol has eased. "In reality our best chance is with Renault," team boss Horner told F1's official website, "and vice versa. "We have won 50 grands prix and eight world championships together -- so sometimes frustration boils...
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