Sauber C32 - passive double-DRS 25 August 2013
In Belgium, Sauber introduced a passive double-DRS system, very similar to that used by Lotus. As you can see, there are two 'ears' beside the airbox which take air in. Further back a single pipe then blows the air under the bottom of the main plane of the rear wing. The idea is that this reduces drag and increases top speed on the straights. The difficulty is in getting the airflow to separate and then reattach successfully to the rear wing. Sauber trialled the system on Gutierrez's car on Friday, but opted against running it in qualifying and the race.