02-25-2025, 06:20 PM
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#1 (permalink)
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Master EcoModder
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Buggie - '01 Vw Beetle TDI Gls
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Gurney flap on new beetle?
How big should it be how high, and really what would be the best shape? I used to have a 1985 Toyota Supra I did had a great big one at the top of the hatch I almost think it might need to be that big
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02-25-2025, 11:58 PM
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#3 (permalink)
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Not Doug
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What happened with Julian?
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02-26-2025, 02:14 AM
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#4 (permalink)
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Master EcoModder
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He got crosswise with the mods. Ask aerohead, I forget the details.
edit:
If you can't get enough, he has a new newsletter. Here's a Youtube video from six months ago: My new free newsletter!
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Last edited by freebeard; 02-26-2025 at 03:40 AM..
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03-01-2025, 12:53 PM
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#5 (permalink)
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Master EcoModder
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No evidence offered for what I suspect, but the roof spoiler of the RSi looks promising.
https://www.coolcarsinchina.com/2018...-rsi-in-china/
Something on the top, might even make something on the bottom effective.
Bottom Example:
https://www.carid.com/sf-pl-mpn/pid-...E&gclsrc=aw.ds
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You cannot sell aerodynamics in a can............
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03-03-2025, 10:05 AM
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#6 (permalink)
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Somewhat crazed
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It's after the high point of the roof, so I wonder if it is operating in disturbed airflow and therefore partially effective. Suspect more drag than downforce BUT it is behind the CG so there would be a stability benefit.
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03-06-2025, 01:51 PM
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#7 (permalink)
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Master EcoModder
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' Gurney flap '
Any drag reduction is going to come from a pressure rise over attached flow, decelerating rearwards on a streamlined diminishing cross-section.
A Gurney flap can't do that.
A truncated Kamm-back is best.
Take a look at roofline 'silhouettes' Volkswagen chose for their :
- Volkswagen 'Flow-Body', L1, XL1
- Porsche 911 GT1, 918, Taycan.
- Audi E-Tron GT
- Bugatti Veyron, Chiron
You just chop the roof off like a loaf of bread, wherever the length is acceptable.
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03-06-2025, 02:36 PM
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#8 (permalink)
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Master EcoModder
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EDAG Biwak Concept 2006
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.tragectory: Line goes down and to the right.
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The Following 2 Users Say Thank You to freebeard For This Useful Post:
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03-07-2025, 09:03 PM
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#9 (permalink)
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Master EcoModder
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Buggie - '01 Vw Beetle TDI Gls
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I love that wagon conversion
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03-17-2025, 08:24 AM
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#10 (permalink)
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EcoModding Lurker
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The size and shape of the Gurney flap really depend on what you're aiming for—better downforce, reduced drag, or just aesthetics. A larger flap, like the one on your old Supra, can help, but for a New Beetle, something more subtle might work just as well. Testing different angles and heights could give the best results without adding too much turbulence.
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