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Originally Posted by Petros
what are those antenna shaped things
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Those are Aero Rakes, which measures and map airflow.
http://www.autosport.com/news/report.php/id/112669
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AERO RAKES
What really grabs the attention in testing are the large aero rakes.
These are made up of an array of Kiel probes which will map airflow across the full surface of the rake.
Commonly these are fitted behind the front tyre to measure the tyre's wake, or towards the rear of the sidepod to map the flow passing towards the rear wing/diffuser. Other positions include around the rear wing or behind the diffuser.
As such a large number of probes are used, the transducer end of the sensor is not mounted to the probe, but connected via a thin plastic tube to a pod elsewhere on the car.
For the very large front tyre wake rakes, the resulting pod can be huge, so it will be mounted well away from the probes so as not to upset the airflow near them.
Another method is to run a simpler rake with a single row of probes, then mount the rake to an articulated arm. While testing, the arm will rise up and down mapping the same area as a large rake.
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