Hyundai Kona electric dust deposition

[Phase]

Originally Posted by caillou

Thanks for the remarks
On the 1st paper from Phase
it's not only bigger doesn't matter, it's even no deflector at all!
the reference [17] which can be downloaded with scihub, assumed that with a less aero shape of the car and higher clearance, deflector can be usefull
in the article, the comparison is only with and without deflector, but it doesn't say if a bigger deflector would be be better. The size may have been limited for design reason: too big, too ugly

On the 2nd article from Phase
increasing size is said to work but not too big. Study is with angular shape, and enclosed wheel

In the end, I probably made my deflector too big, I will cut some of the rigid tape

I was thinking of doing the same thing this week with making my deflectors bigger but came across those recent studies so I decided to chime in. I think I’m going to just added a sloped deflector ramp that goes into the factory OEM deflector at the same height. I’m assuming the engineers in the wind tunnel found the optimal height for each car. The longer ramp obviously can cause clearance issues and look worse on the dealers lot so that’s why they aren’t used

[aerohead]

Originally Posted by caillou

Rails are only negative according to what I heard, especially with a side wind which occurs the majority of the drives
On this forum, roof rack are studied, bars from side to side, but I didn't find a topic about rails from front to rear

Members who've been able to easily remove the rails and seal the openings have done so.
When removing the headliner is required to access the attachment hardware, most owners just 'live' with the rails.
To date, I know of no research which has actually quantified any drag, or crosswind effect attributed to just the rails, sans crossmembers.

[aerohead]

Originally Posted by Phase

https://iopscience.iop.org/article/1...4/7/072005/pdf

This study shows that the angled and slopes wheel deflectors work much better than the straight flat ones most cars use. Think XL1 and light year one/zero car or the front deflectors of a Tesla or Porsche taycan.

Also it looks like “ shutter wheel covers” would be a thing of the future. Like auto grill shutters. The wheels would be fully closed but if they need brake cooling, the shutters will open some gaps in the wheels. Very interesting.

Ford had an F-150 'Atlas' concept truck with battery-powered wheel shutters.
And Mercedes-Benz had dynamic 'morphing' wheels on their 2016 M-B IAA Cd 0.19 concept.
For their M-B EQXX, they just went to camouflaged 'MOONs.'