A paper on aft-end underbody diffusers

[aerohead]

Originally Posted by California98Civic

Quite a beautiful automobile. And that there is quite close to the "template" line, if not right on.



Also has some box cavity elements, no?

Without an overhead, plan-view, it's hard to tell their intention. They may just be providing a hard edge to force separation should the plan contour be a source of bistable flow, where that line could dance around,causing aeroelastic booming and panel flutter.Also, back-soiling of the taillights might have been a consideration. I think Hyundai had a battle royale fighting to get a upper separation line like the A110.

[JulianEdgar]

Originally Posted by aerohead

The 2019 Nissan-Renault Alliance ALPINE A 110 gets away from using a spoiler with this trick,plus the 'template' roofline,as per Hucho, 2nd-Edition,page 281. A 155-mph car.

1. The Alpine 110 uses a full length undertray and rear diffuser. That's why it doesn't need a spoiler. Nothing to do with your trick. Page 185 of my book has a good underside view.

2. Hucho, 2nd-Edition,page 281 does not show your template - not unless your template can comprise three quite different shapes. (In which case, it could hardly be a template.)

Yet again, more misinformation from Aerohead.