The technical challenge of Silverstone

Technical

A special weekend is coming up — the British Grand Prix at Silverstone. It's a crtical point in the season for McLaren and Lewis Hamilton who need to score at least a podium finish to get their season back on track. John Beamer looks at the technical challenge of the circuit.

The introduction of V8 engines and the attempt to limit top-end power have seen more flat out driving — indeed the first half of the lap is almost exclusively with the pedal down. Renault estimates that cars are full on the throttle for about 65% of the lap, which is towards the top end of the range.

The high speed corners require downforce and Silverstone is a medium-high downforce circuit. In recent years this has suited Ferrari, which is known to be sharper in those sweeping high speed corners.

However, in the recent test McLaren looked like they had the edge of the Scuderia (they were a second faster in aggregate) but, without knowing the respective testing programmes, it is difficult to compare times. That Toyota posted the second quickest time (almost half a second slower than McLaren) is indicative that Ferrari weren't going for maximum speed.

One oddity that affects aero performance is strong side winds. The circuits is at a former airfield and is subject to strong winds. Cars that struggle under the constant buffeting could find things very difficult. It will be interesting to see how teams that use the extended engine cover (shark fin) adapt. These fins are designed to increase back end lateral stability under braking. If there are strong cross winds the fins could be more of a hindrance than a help as the wind increases the yawing moment of the car.

Braking requirements are low so teams tend to run small ducts to aid aerodynamic performance. Also there is little risk of the brake systems overheating — the Northamptonshire track is kind on its anchors.

Silverstone is a reasonably bumpy track and requires stiff suspension, especially at the front of the car. Drivers often migrate to the edge of the track when exiting the quick corners, which increases the perception of bumps. Some of the teams will run slightly softer at the rear to help traction in the latter half of the lap.

Because of the high speed corners, tyres are given a solid workout. This is where the F2008 may win the race as Lewis and Mclaren are notoriously hard on their boots (see Turkey). Bridgestone will bring their medium and hard compound tyres to the race; it will be interesting to see who uses what during qualifying.

It should be a good race. McLaren have closed the gap to Ferrari in high speed corners but the red cars are favourites. Either way I suspect we are in for quite a treat.