John Beamer’s F1 tech file: Shanghai

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Felipe Massa (right) used the shark fin wing, Kimi Raikkonen did not

Why did Felipe Massa race with a ‘shark fin’ but Kimi Raikkonen didn’t? How did Fernando Alonso’s ‘under-powered’ Renault out-drag Heikki Kovalainen?

John Beamer of F1-Pitlane has the answers to these questions and more in his technical round-up for Shanghai.

With a couple of long straights the Shanghai International Circuit superficially seemed a Ferrari track. Not so. Lewis Hamilton dominated every session showing just how much progress McLaren has made on the aero front this year – it now, arguably, has a more efficient car aerodynamically than Ferrari does.

With China being the penultimate race conventional wisdom suggest that only the top teams (and the desperate) introduce innovations at such a late stage of the season. Let’s see what the design boffins had in store.

Ferrari fins

Perhaps the most dramatic change of the weekend was the appearance of Kimi Raikkonen’s Ferrari without the ‘shark fin’ engine cover extension despite Felipe Massa electing to run with the device. The shark fin is a an Adrian Newey innovation that improves the efficiency of the rear wing in yaw (ie, when turning a corner).

It primarily works by encouraging air streamlines to traverse the rear wing in a perpendicular direction, which increases wing effectiveness (air hitting the fin is straightened). The net effect is to increase downforce and shift balance rearwards. It is this balance shift that has caused Raikkonen problems and is also why McLaren has not adopted the solution. That Raikkonen, without the fin, was faster than Felipe all weekend suggests that the performance benefit of the device is in any case marginal.

Ferrari and McLaren

Ferrari made a very minor detail change to its barge board pod-fin connectors, making them more curved. This solution was actually introduced for Japan and retained for China. The connectors are designed to help channel air around the side pod undercuts and calm any turbulent front wheel wake that may interfere with the flow.

By speeding up airflow in this region the floor is more efficient because ultimately the diffuser has a lower pressure gradient to overcome. Trying to rationalise the precise purpose of Ferrari’s solution is difficult as the bargeboard region is intricately complex but presumably the wind tunnel data show improved aero efficiency when the connector is curved.

The most significant alternation to the MP4/23 was a reduction in area of the sidepod inlets. This was achieved by placing pads at the bottom part of the inlet i.e., it wasn’t a fundamental design shift. The lower temperature in China meant that cooling was less of an issue for the teams and allowed McLaren to run this solution. By restricting the area of the inlet cooling drag is reduced, which obviously boosts aero efficiency.

Renault blowers

Renault has probably had the most aggressive development programme out of any of the mid-tier constructors this year, bringing in a new front wing for Singapore and revising the sidepod profiles for Japan.

For China the Enstone-based outfit added blowers for the rear wheels. These blowers channel air from mid-region over. The purpose of this is to interfere with the rear wheel wake and reduce lift. Although Renault ran the blowers in practice it didn’t use them in the race.

Engine power

Fernando Alonso charges past Heikki Kovalainen on lap one at Shanghai

One of the few memorable moments of the Chinese Grand Prix was on the first lap when Fernando Alonso out dragged Heikki Kovalainen on the back straight. Who says the Renault V8 is down on power?

There are a number of explanations for this. One, Alonso was lighter and had better traction out of the corner. Two, Kovalainen’s tyres were imbalanced which affected his performance and, three, Alonso may have been running a lower downforce set-up.

However, that is to ignore the fact that Renault has been making "reliability" modifications to its engine in recent weeks as well as using an improved lubricant mix from Elf, its supplier. Paddock estimates suggest that Renault have found 5-10 bhp from this alone.

On to Interlagos

Interlagos is a fine circuit with which to close the championship – who will it favour, McLaren or Ferrari? Interlagos is a medium downforce track and rewards aero efficiency. China demonstrated that McLaren is aerodynamically strong and given that it has reportedly developed a special Interlagos package the car should be better than it was in 2007.

However, these days track surface and temperature are as much a factor as car design, so it is a safe bet to assume nothing until Saturday qualifying.

Those fretting about Hamilton’s engine probably needn’t worry. The Mercedes power plant is ???ber-reliable and McLaren will no doubt turn the unit down that little bit more than it might. Plus, Hamilton romped away with the lead at Shanghai and probably turned the wick down quite early on.

Interlagos isn’t a particularly demanding circuit on the engine with only 57% of the lap at full throttle. The higher altitude isn’t necessarily a factor as pistons, for example, receive less wear.

Those who worry about writers’ curse go and put your money on a McLaren engine failure immediately!

This is a guest article by John Beamer. If you want to write a guest article for F1 Fanatic you can find all the information you need here.

8 comments on “John Beamer’s F1 tech file: Shanghai”

  1. Felipe Massa (right) used the shark fin wing, Kimi Raikkonen did not

    Why did Kimi Raikkonen race with a ’shark fin’ but Felipe Massa didn’t? How did Fernando Alonso’s ‘under-powered’ Renault out-drag Heikki Kovalainen on the back straight?

    Contradiction in terms there with the Ferraris, no? :)

  2. Yep – that was my fault, not John’s! Fixed.

  3. I’d be no good as a detective. I watched the whole of the race and never noticed that Kimi wasn’t using a shark fin! :)

  4. Chalky – I was the same with the asymmetrical sidepods on the McLarens earlier this year. We’ll have to keep an eye on what the Ferrari drivers use at Interlagos.

  5. Not relevant to topic …
    But trying to find answers to that…
    Kimi recently said that he has reverted back to old set up configuration and it seems that it is working quite very well.
    Any guess why did they change the configuration especially after winning the WDC with it nor did they do it on purpose to find more speed?
    He also said that they completely rebuilt the car for him before BELG GP.
    Could he have won WDC would these changes took place somewhere at around round 5 or something like that?

  6. I noticed that understeering cars like Ferrari and Toyota have covers on front and rear wheel rims while oversteering cars like McLaren and Red Bull only on front wheels.Any idea why there is this difference?

  7. “…However, these days track surface and temperature are as much a factor as car design…”

    On this field, what I discovered was that we would have a GP weekend in Brazil with temperatures very similar to Shangai:

    Some clouds
    Min. Tem.: around 24ºC
    Rain probabilities: 33%

    Some clouds and Rain
    Temperature: around 27ºC (at qualifying time)
    Rain probabilities: 80%

    Some clouds
    Temperature: around 24ºC (at race time)
    Rain probabilities: 40%

    Last year, we had a clear sky with temperature around 36º C. A very different scenario!

    Source: CPTEC/INPE

  8. There isn’t even a snowflake’s chance in hell that Lewis won’t win the WDC. An engine failure is highly unlikely. I think he will go light, secure pole, so as to avoid any episodes at the start, then drive smartly and finish no lower than 4th. Even if Massa wins, Lewis will easily take the title.

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