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Mechanical Engineering
Why do more cars now have a short "spoiler" above their rear window?
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[QUOTE="jack action, post: 6866351, member: 240508"] When well designed, it is used to delay flow separation to reduce the wake behind the vehicle (and the drag it creates), akin to the bumps on a golf ball: [CENTER][IMG]https://www.researchgate.net/profile/Awadh-Kapoor-3/publication/323048342/figure/fig1/AS:713104803512320@1547028842041/Flow-Separation-on-a-Golf-Ball-1_Q640.jpg[/IMG][/CENTER] So you want to "trip" the flow to create a turbulent boundary layer. Here is an example of such a spoiler on a trunk: [CENTER][ATTACH type="full"]323693[/ATTACH][/CENTER] You want to create something that looks more like the top image than the bottom image in the next figure: [CENTER] [ATTACH type="full"]323695[/ATTACH][/CENTER] Also, referring to the spoiler in the OP, the long flat surface extending the overhang of a hatchback model can create a greater surface to improve the downforce at the rear wheels, increasing stability. (Of course, if well designed for the vehicle.) [/QUOTE]
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Why do more cars now have a short "spoiler" above their rear window?
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