Most of the premium racks comes with some type of textured rubber insert that disturbs the airflow and breaks up the frequency of the Aeolian noise we mentioned earlier. Using a wind fairingwill definetely help in reducing wind noise, but let's face it, it's just another piece of flimsy kit that gets in the way of loading and unloading your gear.
A wind fairing is a plastic shield attaches to the front cross bar and attempts to divert airflow over and away from the bar to reduce wind noise and drag. Most manufacturers have one in their product line-up. The first option is to add a wind fairing. The secret to reducing the noise from a roof rack is by either diverting or disturbing the airflow around the cross bar. A square bar has a drag coefficient of about 1.05 a sphere is around 0.47 and an airfoil is as little as 0.04. If you compare the different shapes of cross bars, there is a masive difference in the drag coefficient between them. The higher the drag coefficient, the more noise is created. The amount of noise depends on the speed of the airflow (how fast you are driving) and the drag coefficient of the cross bar. If the surface the wind passes over has a consistent shape, the disturbance becomes tonal and at certain frequencies very annoying.
The wind noise we hear from some roof racks is known as Aeolian no ise and is produced by wind when it passes over or through objects. Check Prices The problem: Why does my roof rack make a noise?
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