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Originally Posted by ademonrower
Thank you: good to know. Perhaps I have then gained more in cabin comfort than in reduced drag :-) I've just made what I call a tailgate flow-extender. I don't know what it's really called. Perhaps you can help me there. pics attached. Basically just to see how it looks/works in preparation for something more "proper". Made from transparent PET heat-formed, and attached with a curl-over to the upper rim of the tailgate.
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Lucid's lead designer for the upcoming Lucid Gravity SUV, Derek Jenkins, refers to them as a ' rear wing', which on the Gravity, will have 'massive rear overhang', helping to make it the 'most aerodynamic SUV ever'.
Some designers combine them with boat-tailed burst-edges down the sides of the rear glass, creating a shallow, hollow tail on this angled rear to allow for a little additional pressure recovery.