How to Build a Car

So for my final-year project I chose to study ‘ground-effect aerodynamics as applied to a sports car’.

I set to work. I made a wing out of aluminium. This would go on the underside of my car, which was to be a road-going sports model. I tested it on its own using pressure taps to develop the shape in a small wind tunnel until I was happy with it. I designed a one-quarter-scale model of the car, which incorporated the underside wing shape, made it, and then took that into the main 7ft × 5ft tunnel.

It’s fair to say, I’ve spent a good part of my life in wind tunnels, understandably so when you consider the huge benefit they offer to someone who designs performance cars for a living. A wind tunnel allows you to measure how much downforce and drag you’re generating, and how that downforce is distributed; how much is on the front axle, how much is on the rear. You can also measure side, yaw and roll forces. With various caveats, you can measure the full aerodynamic performance of a car without actually having to build the car itself.

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