I dont agree 100% with aerohead on this reading stuff. Its good to read lots of books and previous studies but there is always coming new and better info which might disagree with the old data. So when should you start building and testing a new car model? I would say right now. You do learn every day, week or month new things about aerodynamics but then you can improve the already good model you have manufactured.
Here I like to thank Aerohead from that Template and ERTW for those neat simulations.
You do need to take a look of those cars aerohead mentioned and also few never ones, but you dont need to be a aerodynamic mastermind to make a car which Cd is under 0.2. Ofcourse it depends on the goals also, but then you just need to pick a vehicle that is closest to your target Cd and make few modifications to it.
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