Renault R29 - revised diffuser design 25 April 2009
Introduced only on Fernando Alonso's car in China, Nelson Piquet also has Renault's revised aero package in Bahrain, with new bodywork and a double-decker diffuser. As you can see from the drawing, the diffuser's central channel is very wide, with the second upper deck channelling airflow from an opening in front of the rear axle, where the reference and step planes meet.
