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Used for the purposes of measuring the vehicle aerodynamics, typically used in aero tunnels and preseason testing
Sometimes they also use yellow/green wet paint on cars to measure aerodynamics during preseason testing
Huh I was wondering what the green paint was for in the channels/curves for the cars.
At first I thought it was just Aston Martin's cool new livery, but then thought maybe it makes cracks and stress patterns more visible but nope...
Thanks for answering!
It's instrumentation that measures the airflow pattern.
Formal term is 'aero rake'
It does disrupt airflow behind it, but it’s about sensing it in that specific area, usually behind some key aero feature or wheel.
It's called an aero rake. It's basically a collection of pitot tubes. They measure airflow at various parts of the car to
1) see if it correlates with the models they used to generate the aerodynamic surfaces
2) feed back to the team to continue refining upstream flow generation to achieve the performance they want
A good 2019 article on the official F1 website can be found with a quick Google search that will give you more detailed insight into this
https://www.instagram.com/reel/CpBKqtGopEc/?igshid=YmMyMTA2M2Y=
On some testing they’ll run those, they’re usually referred to as “rakes”. They give teams live streams of aero data flowing off of the aero. You’ll see them behind the wheel covers on each side, as well as a singular rake across the rear wing and rear diffuser.
Other methods of testing aero include “flow-vis” which is a high contrast liquid that adheres to the car. Usually put directly on side pods. Leading edges of main plates. Flow-vis allows engineers to see low pressure and loss of down force develop across the plane.
I believe, it is a rule that flow-vis and rakes cannot be used at the same time. Could be wrong though.