Thanks (today) for the video. The front end part was interesting; the active wing, not so much.
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a small diameter rod (~1\8"?) to hold a tuft
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A golf tee carved into an airfoil section with a magnet embedded in the head? One could move a flock of them around to different parts of the car.
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Don't know why there's no Thanks button.
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However, Dick Barnard .... showing his university students the trailing vortices off models in the wind tunnel by using a long rod and a single tuft.
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I've imagined a stepper motor in the front bumper with a telescopic arm with a streamer (or smoke generator) the length of the vehicle.
All could be controlled by e. g., a Raspberry Pi with GIPO.