Why Don't Car Makers Dimple Sheet Metal to Reduce Drag?

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SUMMARY

Car manufacturers do not dimple sheet metal to reduce drag primarily due to manufacturability challenges and aesthetic considerations. While dimples on a golf ball effectively reduce air resistance, applying this concept to vehicles presents difficulties in production and design. Lexus has begun implementing dimples on the underside of certain models to address specific aerodynamic needs, particularly in areas prone to negative pressure gradients that cause boundary layer separation.

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  • Understanding of aerodynamics and drag coefficients
  • Familiarity with automotive design principles
  • Knowledge of boundary layer theory
  • Basic concepts of manufacturability in automotive engineering
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  • Research Lexus's approach to dimpling in automotive design
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Automotive engineers, aerodynamicists, and design professionals interested in optimizing vehicle performance and understanding the balance between functionality and aesthetics.

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This is my first post on this site and I figured I would maybe get a good answer to this question. If the dimples on a golf ball are to reduce the amount of friction due to air resistance, why don't car manufacturers dimple the sheet metal on their cars to reduce coefficient drag?? Just wondering.
 
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I believe Lexus is now doing it to the underside of one of it's vehicles. Since the vehicle is not spinning, I would think there would not be a need to dimple the entire surface of the vehicle, just where the aspect of a negative pressure gradient would want to cause separation of the BL (the rear side of the car). The dimpling would not be a good idea on the entire car for a couple of reasons I can think of:

1) Manufacturability would decrease i.e. it would be harder to make them.
2) The asthetics of the vehicle would be horrendous. The vehicle has to loog good or it won't sell.
 

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