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Old 04-30-2021, 03:32 AM   #1 (permalink)
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Hyundai video



Worth pausing the video to look at the undercar simulated airflow.

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Old 04-30-2021, 04:11 AM   #2 (permalink)
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youtu.be/4dOKlf1OQuA?t=81

< & > keys to advance frame by frame.

I like the detailing of the design, all except the unfortunate crease through the doors.
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Old 04-30-2021, 08:51 AM   #3 (permalink)
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Click image for larger version

Name:	delete.jpg
Views:	32
Size:	46.7 KB
ID:	30594

Has anyone solved the wheel arch/cavity issue? You can't put a panel there because the wheel couldn't turn, but it creates a lot of turbulence
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Old 04-30-2021, 08:56 AM   #4 (permalink)
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At the 1:40 mark, the "spoiler hole" at the rear roof plane works similarly to the slotted roof wing on my pickup truck.

First time one of these treatments appears to be a integral part of the car and not simply a tack-on. Probably just an artifact of their presentation, not sure what the production vehicle is going to look like.

Range anxiety is being countered with aerodynamics, it's about time this selling point is made public.
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Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html
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Old 04-30-2021, 09:00 AM   #5 (permalink)
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Quote:
Originally Posted by AeroMcAeroFace View Post
Attachment 30594

Has anyone solved the wheel arch/cavity issue? You can't put a panel there because the wheel couldn't turn, but it creates a lot of turbulence
Looks like a job for an air-curtain ?

EDIT:

Found this image researching the idea.

Porsche Panamera extra-large lightweight underfloor cover for improved aerodynamics
https://www.motor1.com/photo/319669/...-aerodynamics/


For the above to work, the underbelly wheel opening is an inlet for the wheel that acts like a fan which in turn changes the direction of the air 90 degrees for yet another air curtain over the outside face of the wheel.

Certainly more complex than the idea I had in mind which is to add a convergent duct in the front chin apron and jet it at the belly pan plane just prior to the opening.
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1977 Porsche 911s Targa
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1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html

Last edited by kach22i; 04-30-2021 at 09:10 AM..
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Old 04-30-2021, 01:15 PM   #6 (permalink)
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panel

Quote:
Originally Posted by AeroMcAeroFace View Post
Attachment 30594

Has anyone solved the wheel arch/cavity issue? You can't put a panel there because the wheel couldn't turn, but it creates a lot of turbulence
As long as the new car vehicle specification precludes skirts, all they can do with the 'flush' wheels is basically what we're seeing.
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Old 04-30-2021, 04:48 PM   #7 (permalink)
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Quote:
Originally Posted by AeroMcAeroFace View Post
Attachment 30594

Has anyone solved the wheel arch/cavity issue? You can't put a panel there because the wheel couldn't turn, but it creates a lot of turbulence
Under the car? I've not seen any solution for this.
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Old 04-30-2021, 05:13 PM   #8 (permalink)
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Does anyone see an official figure for the cD ?
I'm seeing that someone made a comment on the video that it has a .288 ....er....( "decimal places" ) ...point 29drag coefficient.

Why are they bragging about this ?
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Old 04-30-2021, 05:18 PM   #9 (permalink)
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Quote:
Originally Posted by Cd View Post
Does anyone see an official figure for the cD ?
I'm seeing that someone made a comment on the video that it has a .288 ....er....( "decimal places" ) ...point 29drag coefficient.

Why are they bragging about this ?

Jinhyuck Chang
Head of aerodynamics in Hyundai Motor Group:

Even though the aerodynamic number of Ioniq5 is not good enough, it was challenging for aerodynamic engineers to develop under 0.29 with this rear end form. The inclination angle of rear glass is around 30 degree. We could control strong vortex from C-pillar with a rear spoiler and a hole.
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Old 04-30-2021, 05:54 PM   #10 (permalink)
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Cd 0.288

The generation it replaces was Cd 0.24. 'guess they're paying for the K-form roofline mutilation.

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