Sauber strangely decided to take a few steps back in evolution and reverted back to the European rear wing version combined with the enlarged engine cover’s shark fin at Singapore alongside with the Spanish rear wing spec . Founding out that the older parts are better than new must really make a F1 team nervous and frustrated .
Like all teams so Sauber brought a special very low downforce rear wing for Monza with single vented endplates , keeping also its F-duct system to gain extra speed at straights .
The Canadian low downforce rear wing with the double vented endplates was brought back to use at Spa .
Sauber despite budget deficit paid a lot attention to C29 car aero details and so another small revision took place at Valencia . In particular C29 had its shark fin profile extended to the bottom to increase car streamline efficiency and to provide a smoother airflow towards the rear wing profile . As regards the rear wing itself Sauber raced the Spanish version .
Sauber abolished the use of the F-duct system at slow Monaco city roads and re-used the spec first seen at Melbourne .
The C29 raced a much lower downforce rear wing spec at Canada which had fewer endplate gills ( 2 gills instead of 4 ) and a reduced chord . The F-duct system was also updated to the needs of the new wing blowing now the upper second plane instead of the main profile .
Finally Sauber made it to race its own F-duct version to gain extra speed at long Catalunya finish –start straight . The F-duct system though was significantly updated since the previous tested only versions . It now receives air from a duct placed in front of the cockpit rather than the sidepods , which is similar to the one featured by Mc Laren MP4/25 .