F1 2009 technology: Mid-region

Teams have different solutions for the mid-portions of the cars

Teams have different solutions for the mid-portions of the cars

F1 Fanatic guest writer John Beamer continues his technical analysis of the 2009 F1 cars with a look at the mid-section of this year’s designs.

When comparing a 2008 and 2009 F1 car the wider front wing and squashed rear wing are the most dramatic changes. Look closely again and one can see equally striking changes in the mid-region.

The new technical regulations vastly restrict the deployment of bargeboards and podwings. Boards were pioneered by McLaren in the early 1990s to manage airflow to the diffuser and around the sidepods. The airflow interactions are complex and involve the creation of many vortices to steer the flow under and around the floor.

Podwings are outgrowths of the sidepod bodywork and were initially developed by the old BAR team in 2005. They condition turbulent flow from the front wheels, calm it and funnel it to the rear wing giving more consistent performance (e.g., when cornering).

Last year BMW were the first team to integrate the devices, often with the axe-head (the section of floor jutting out ahead of the sidepod).

The 2009 regulations were designed to eliminate bargeboards/podwings and although the plethora of turning vanes that used to adorn a car has disappeared, the rule-makers haven?t been wholly successful as teams are still running smaller devices.

How did this happen?

The regulations specify a restricted area, which means there is only a very small zone close to the monocoque where a bargeboard is permissible. In addition the FIA specified that bodywork around the sidepods must meet minimum radii requirements, although there is some freedom at the front of the pods where the impact structure terminates. Many commentators, including me, thought that bargeboards and podwings would disappear but teams have been creative in their interpretation of the regulations.

Nearly all teams have adopted some form of bargeboards. Although they are more angular, smaller and less effective than in years gone by, their ubiquity suggests a significant performance gain which is magnified by the banning of more forward turning vanes. Given the tight design cycles there isn?t a lot of variance (yet) in size and shape of the designs. Over the season expect flicks and saw-tooth edges to proliferate as teams optimise aero performance ?ǣ a close look at the BMW boards shows a small fin on the top edge.

Pod wings on the Ferrari F60

Pod wings on the Ferrari F60

Deploying podwings was a little more controversial as teams must interpret the language in article 3.8.6, which defines what bodywork must be enclosed by the side-impact structure. There is a small zone ahead of the sidepods where bodywork can be deployed. In addition some team (notably Ferrari) have shortened the and adapted the sidepod fronts to give more space to deploy podwings. At this point almost all the teams have the devices ?ǣ Brawn GP excepted – although McLaren, Williams and Renault only adopted them recently. By 2010 these loopholes may be closed.

Among the teams that use pod wings there are different interpretations. Ferrari?s rise from the floor, jut some way forward and house the mirror. They also have a slit for calming some of the air that is disturbed by the tyres ?ǣ the slit allows high pressure air to bleed through reducing air vorticity. Other teams, like Force India, have managed to design more conventional pod wings that form a close section with the axe-head. By the time the F1 circus returns to Europe expect an even greater variety of pod wing and barge board design.

Pod wings and barge boards aside, the most notable change in the car?s mid-regions is the absence of all other fins and flick-ups. As such the new cars look much sleeker than their 2008 counterparts. The FIA hopes that will create close racing.

In just over a week?s time we should find out.

For a complete exposition of podwings and bargeboards read my article in issue 8 of Bernoulli Aerodynamics International.

Read more: F1 2009 technology: front wing

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6 comments on F1 2009 technology: Mid-region

  1. Fantastic analysis :)

    Could you also explain why have the sidepods changed so much from 2008 to 2009? Mclaren & Brawn have narrower and higher ones. Others have conventional sidepods.

    Is it something to do with the Mercedez engines?

    • John Beamer said on 20th March 2009, 0:21

      The cooling requirement has changed – no vents and chimneys means that the sidepods now need to contain a greater volume for the same cooling – although the lower RPM for engines will offset that a bit (which itself will be offset by KERS, which has a heavy cooling requirement).

      One reason for the change in shape will be to channel air around the sidepod undercut to the coke-bottle zone and over the diffuser. In the old world bareboards played the role of channeling air to the diffuser. The new regs means that undercutting the sidepods at the front will improve airflow in this zone.

  2. Brawn’s design is also to do with the non KERS setup needing less cooling (ie only for the engine)

  3. theRoswellite said on 19th March 2009, 16:29

    John Beamer, again, what a great addition to F1F. Please keep your contributions coming.

    It would be interesting to read any comments you might have regarding the present speed advantage expressed in the BrawnGP design (assuming it is this and not the engine or drivers). As in….are we seeing a cumulative effect, or do they have a key element giving them a significant gain, perhaps the diffuser? Also, will it be possible for you to differentiate between aero and mechanical success?

    Keep up the great work!

  4. pSynrg said on 19th March 2009, 21:21

    Couldn’t agree more. F1F with expert analysis like this is now punching seriously with the heavyweights.
    I hadn’t really absorbed the existence of pod addenda with the 2009 designs but now find myself checking them all out…

    • I thoroughly enjoyed this article :) I think i’m one of the few people who actively likes the new cars (well at least amongst my peer group anyway) especially the Brawn GP car. I would love to know, as we all would, what the brawn has that others don’t.. Does anyone know if there intending to run KERS? I think other people have mentioned but I’ve found myself looking over any HQ 2009 car picture I can come across and re-examining them.. I really hope the Mclaren finds more pace.. It would be a shame if they had an off season due to design flaw but I suppose even the big teams slump.. good example would be the recent incarnations of williams..

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