European GP: Renault engineering preview

Renault's Pat Symonds, executive director of engineering, and Denis Chevrier, head of engine operations, give thier view of the European Grand Prix Pat Symonds: "The Nürburgring is, of course, famous for its climate and while this year,...

Renault's Pat Symonds, executive director of engineering, and Denis Chevrier, head of engine operations, give thier view of the European Grand Prix

Pat Symonds:

"The Nürburgring is, of course, famous for its climate and while this year, racing at the circuit in late Spring may mean that the chances of rain are less than at other times of the year, the notoriously unpredictable Eifel region will of course remain susceptible to rain. Where previously, wet weather would have seen a large number of modifications made to the car, the current regulations mean that wet running, which was already a severe compromise, is now even more so."

"When we are visiting a new circuit, or when an existing race moves in the calendar, one of the first things we do is to analyse the thirty year averages of temperatures and rainfall: for this year's Grand Prix date, the averages are 0.8mm of rainfall per day, with a maximum temperature of 18.30C.Once this has been done, then our attention turns to forecasting, but in F1 our needs are very different from a typical weather forecast: we need to know whether it will rain, at what time, what the temperature will be and the windspeed and direction - all within the very precise area of 1km - within a timeframe of approximately 90 minutes. And to do this, we need very accurate weather predictions."

The first step, as an event approaches, is to back up original data with precise information from a number of sources. We employ a UK-based weather service to study meteorological data that is not publicly available, and then feed this data into weather prediction models. However, to meet our very specific needs, we need an even more sophisticated approach at the circuit."

"A mobile radar system is set up on a hill nearby the circuit, in order that it can look some distance in all directions. Indeed, the way in which we ask the radar to work is almost completely opposed to its conventional use: while commercial systems are specifically designed to ignore rain and track large airborne targets, weather radar is tuned for maximum reflection from small water droplets. Combining weather radar with GPS and tracking software, we can obtain extremely accurate predictions of short-term weather changes - to the extent that we can predict which corner will be affected first, to an accuracy of a few minutes."

"In terms of how running in the wet affects the cars, the manner in which we approach this challenge has changed significantly in recent years. Previously, a raft of changes would be made to the car in order to adapt its handling to the low grip conditions. Under current rules, however, the changes we are allowed to make are minimal: the FIA permits an initial set of changes, which include changing to wet weather tyres and reducing the size of brake ducts in order to maintain the brakes at their optimum operating temperatures (although this parameter must be judged carefully against the possibility of the circuit drying out later in the race, and the brakes thus potentially overheating)."

"The second set of modifications allows us to change to extreme wet weather tyres in order to clear standing water more effectively. More than ever this year, because we must run the cars in configurations that are far from being optimised for wet conditions, wet racing comes down to driver ability. Not only do they have to cope with a more difficult car, they also must deal with constantly changing levels of grip and visibility. In these conditions, the driver needs to be able to quickly find the car's limit in abnormal conditions, but also to control the car when he steps over this limit - as inevitably he will."

"Resourcefulness becomes all important as in these conditions, no two laps are the same. The driver requires innate natural skill to control a car on and beyond the limit, but also needs to be inquisitive in how he drives, exploring different lines and different parts of the circuit to find the highest levels of grip. Even more than usual, though, racing in the wet is where an F1 driver demonstrates what sets him apart from the norm: for those of us trackside, running in a ball of spray with near-zero visibility, constantly changing grip levels, on the limit, is really something we cannot properly understand."

Denis Chevrier:

"The Nürburgring is, to my mind, the first of the current generation of modern circuits, with everything that implies in terms of lap speeds and circuit characteristics. In many ways, it is something of a standard circuit: the percentage of the lap spent at full throttle is identical to the season average, at 59%, while the longest continuous period is some way below average, at 10.2 seconds."

"The circuit is of course situated in the Eifel mountains, and this does mean that altitude has an impact on the power produced. We race at approximately 500 metres above sea level and the result is a power loss of around 5%.This of course also means that the engine is under less load, as it is producing less power."

"The other notable characteristic, even racing in late May, is that relative to the other Grands Prix, ambient temperatures are relatively low. However, this does not place us in an unknown situation as while they differ to our typical race weekend conditions, the temperatures are similar to those often encountered in winter testing."

"For the engine, this poses no real problem, but it does make balancing the chassis a more difficult exercise and we will not necessarily see many teams venturing out early in the first session on Saturday morning. Climatic conditions can also play a role in the form of precipitation at this race, but it does not require any specific preparation on our part: the chance of rain is an eventuality we must be ready for at every race."

"When running in the wet, the driver needs many of the same characteristics as at a low grip venue such as Monaco: good traction, and smooth power delivery. It is once again the engine's electronic environment that receives particular attention in order to provide these characteristics in the event of inclement weather."

-renault-

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Series Formula 1