Ioniq 6 cd of .21!
https://www.carscoops.com/2022/06/th...1920s-and-30s/
Taking inspiration from the old days for stream lining and achieves a cd of just 0.21! |
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Those boxy rear-view cameras seem mismatched.
They didn't discuss the 'separation traps', did they? |
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It's a start folks. :cool: |
I'll spend the rest of the day catching up on the Pelican Parts thread. :thumbup:
http://forums.pelicanparts.com/uploa...1656530952.JPG Permalink 51946 Same fender line. It's a porky looking thing compared to the concept: This is it! Hyundai IONIQ 6 - What happened? |
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I'm just delighted the stupid oversized faux grill fad isn't being perpetuated in this design.
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Impressive CD, but I still cant help but see this from the front:
https://ecomodder.com/forum/attachme...1&d=1656881317 https://sasatimes.com/wp-content/upl...s-Benz-EQE.jpg |
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https://www.thecurrent.org/feature/2...reak-harmonica https://img.apmcdn.org/e2db34e0e0314...521-dylan6.jpg |
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IONIQ-6
Looks very familiar.
'Free-range kilowatt-hours' |
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Nice retrospective. Although, the 1986 Olds Aerotech is a stretch.
I'm putting the 2022 Tatra 77 Homage concept in the Interesting Aerodynamic Cars thread. https://www.motorbiscuit.com/wp-cont...p?w=1200&h=801 |
Tatra 77 Homage
' would have been nice for us if it was actually a self-powered, producible concept, that they'd road tested and run the numbers on.
The more comfortable consumers become with these uninterrupted 'single-bow' rooflines, the better. |
IONIQ-6 Road Test
The latest issue of MOTOR TREND includes a brief road test of the car in South Korea.
Length-191.1" ( 4853.94mm ) Width- 74.0" ( 1879.6mm ) Height- 58.0" ( 1496.06mm ) Cd 0.21 ( compared to the Cd 0.29 IONIQ-5 ) Estimated Af 26.03- sq-ft ( 2.41826 meters-sq ) Est. CdA 5.4663-sq-ft ( 0.50783- meters-sq ) [ @ 86% of gross area ) The author believes that the aero will add 15-20% range, compared to the IONIQ-5. @ 77.4 kWh, that's 2.29639-gallons-e EPA COMBINED 130.639- mpg Range about 273-miles @ 100% SOC. I estimated a L/sq-rt of Af @ 3.121349 At this est. fineness-ratio, the Hyundai's body is more efficient than: 2006 Chevy Cobalt ECOTEC LSR 2020 LUCID AIR work-in-progress 2021 Tesla Model S Plaid 1989 Renault Megane concept 2007 Ford Fusion 999 LSR 1935 FKFS 5-PC K-form model ( lange-heck ) 2014/2017 SPIRIT of Ecomodder.com ( w/ unibody/Viper windshield, grilleblock/ SCCA racing mirrors/ restored belly pan ) The 1984 Citroen ECO 2000 concept data remains unavailable to us. |
Thanks for the cD figures. I just came across a test of this car and hung on to find out the cD.
After a moment or two of looking at the design from different angles, I just said to myself that this one was just another Nissan Leaf type design - stubby and no more aero than what we had nearly 30 years ago. Thanks for proving me wrong ! .21 is pretty decent ! |
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This is yet another car that puzzles me. It has too "fast" of a drop in the rear glass, yet gets a .21 cD. I would have thrown up my hands and given up on the idea of templates and boat-tails, except for the fact that the Mercedes Concept IAA dropped it's cD lowest with the addition of a short tail section. So, Aerohead - if this design had just left off that shelf spoiler, and instead followed the template curve, would the cD have been lower ? |
IONIQ @ 'template'= 'lower'?
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The Ioniq 6 ( pseudo-Jaray ), @ a fineness ratio of approx. 3.121349, and Cd 0.21 IS more efficient than some other Cd 0.21 cars. However, if you consider the M-B Bionic Boxfish ( kammback ), which is 12.7% more 'bluff' yet Cd 0.19, or the Coventry University-modified Audi A2 ( kammback ) , which is 16.9% more bluff, and Cd 0.204, then the Ioniq doesn't shine so bright. If you agree that the Ioniq 6 shares DNA with the 1968 PORSCHE 911 ( pseudo-Jaray / pseudo- Lange-car ), and the 911 had serious lift and drag issues, and the proper solution was a 'kammback', then it's not a reach of the imagination that a 'kammback' on the Hyundai would have improved things. Since 1974, I've seen no evidence that a 'shape' exists, which can out-perform the 1930s 'kammback.' |
'separation traps'
While a video at carscoops purports to explain all the aero tricks used on the Ioniq-6, it failed to do so.:(
--------------------------------------------------------------------------------------- PS: As to the shape that's never been seen before, I'd recommend a look at the 2011, Mercedes-Benz F125 concept's roofline. |
'Hyundai Ioniq 6 Aero Secrets'
I GOOGLED 'Ioniq 6 in wind tunnel, and this video came up.
This is all in Korean, with English sub-titles, by the CFD and wind tunnel folks who did the grunt work on the car. All the tricks are discussed, however, no 'quanta' are provided. https://insideevs.com/news/621207/hy...ic-efficiency/ |
They're got themselves a really photogenic wind tunnel. :)
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'photogenic'
Yeah, she's a real sweetie!
Anechoic too! Which could lead one to believe that the now-infamous 'separation trap' was as much to do with 'noise' as it was drag; since it's also something regulated by the EPA.;) |
Ioniq 6 Blueprint
For anyone interested in the parametrics, blueprints are available.
https://www.the-blueprints.com/vecto...undai_ioniq_6/ |
some observations from Ioniq 6 blueprint
Al printed off a blueprint of the 6 for me, and I photo-enlarged it up to my contour scale and threw it on the light table.
* Without the upper and lower rear spoilers, the roofline is a very close match to Wolf Hucho's 1978, basic, 1/2-body roofline, on display in the Deutsches Museum in Munich. It goes as steep as 29-degrees slope, and produces Cd 0.15. * If you create a vertical line, originating at the rear face of the 6's rear tires, and project it upwards, it will intersect the backlight where there's a probability for flow separation. * The upper spoiler's tearing edge lofts the separation point upwards, with a tangent angle relaxed to 15.5-degrees off horizontal. This re-accelerates the flow, mitigates the adverse pressure gradient, allows for re-attachment, and some pressure recovery before the flow reaches the wake. This tearing edge 'contour' is almost a dead match to Wolfgang Klemperer's 1922, basic, 1/2-body, tested at the Zeppelin Werke. * From the Hyundai wind tunnel smoke-flow imaging, the lower spoiler is almost completely embedded within the turbulence behind the upper spoiler, catching only a little edge flow. ------------------------------------------------------------------------------------ If you're tracking parametrics, you'll notice that the Ioniq 6's aggregate dimensions are very similar to those of other cars of similar Cd. |
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