Hyundai Kona electric dust deposition
 

Kona electric = 0.29 Cd. Unusual to get an electric car on my local dusty roads.

https://i.postimg.cc/mgQJwzQ4/IMG-1163.jpg

There's a mixture of dust deposited by low aero pressures and heavier mud flicked up by wheels. Looks to me like there is some separation ahead of the flared rear wheel arch. Very good attachment, though, behind the rear wheel as far as the separation edge - except right down the bottom.

https://i.postimg.cc/mgJ3t8c2/IMG-1169.jpg

The back looks very good. Top separation edge (roof extension) working perfectly, side of hatch extensions (complete with vortex generators) again working well, hard to tell how well the upper light and immediately below it is working, and then lower sep edge again working well.

Just by observing their cars, I do think Hyundai / Kia are right at the leading edge of this stuff - but no tech papers as far as I know.

Skip to 1:11

https://www.youtube.com/watch?v=sVU1...ature=youtu.be

How to wash it off, I don't know.

I would argue Mercedes Benz is the manufacturer who is leading in therms of aerodynamics, and that has been the case for a long time.
A CD of 0.29 isn't exactly something to be proud of these days, especialy since it's an electric car that can have a perfectly flat undertray as there isn't an exaust in the way.
Keep in mind, the Audi 100 (C3) had a CD of 0.30 40 years ago.
Meanwhile the Mercedes W213 has a CD of 0.23 and we have a thread about a new one that reaches 0.20.
But still, dust makes for great visualisation.

0.29 is actually pretty good for a lower cost squareback! It’s not fair to compare that with a very expensive sedan - much easier to get low drag with a sedan shape and lots of dollars.

lower cost
 

A generation back, three flavors of the Mitsubishi Mirage 5-door had Cd 0.27. Mitsubishi took advantage of the greenhouse length, lost on many other vehicles of higher drag.
It's an A segment minicar, but it's shape would scale all the way up.

Well, they could have picked a more efficient shape for that car.

I'll let someone with Photoshop skills upsize a Mitsubishi Mirage into a CUV with appropriate ground clearance. I'd think it would look pretty weird - but maybe not.

On that logic every car could be down at Cd=0.2. Obviously, car makers have more aims than just a low Cd.

But we seem to have got side-tracked. If you look under current Hyundai / Kia models you'll soon see that they are right up there with the best - eg very similar to current Audi undersides.

Yeah, I've tried using it. In the real world, it's hard to get the viscosity right. Too viscous and it doesn't move, not viscous enough and it just follows gravity.

I'm trying a few aero mods on this Kona EV
- bluedrive side badge removal
- hood front gap with a seal inside
- wheel trim gaps covered with tape
- wheel spoilers size increased with tape

I would like to remove the roof rails but it's not reversible and the plastic covers are not sold on european websites, only US ...
Search for "kona limited roof rail removal" to see pictures
(can't post a link yet)

I also removed the subwoofer which is too strong and weights 4kg

https://i14.servimg.com/u/f14/18/59/41/51/img_2011.jpg
rear
https://i14.servimg.com/u/f14/18/59/41/51/img_2012.jpg
front
https://i14.servimg.com/u/f14/18/59/41/51/img_2010.jpg

https://i14.servimg.com/u/f14/18/59/41/51/img_2013.jpg
https://i14.servimg.com/u/f14/18/59/41/51/img_2014.jpg