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Renault R25 - sidepod fin development 24 July 2005

In Germany, this additional fin, introduced a few races back, takes on a vertical edge at its rearmost point. This helps to manage even more accurately the way airflow is directed to the rear of the car, in particular over the side section of the diffuser. The 2005 rules have dramatically reduced aero efficiency and downforce in this area, so every little thing is considered in a bid to claw back the subsequent loss of grip.