Making the Ioniq slippier

[freebeard]

You'll [likely] never eliminate the vortexii squeezed out to either side as the rubber meets the road.



I should resize and re-up that picture, it's 4400x2475!

[Phase]

Originally Posted by freebeard

You'll [likely] never eliminate the vortexii squeezed out to either side as the rubber meets the road.



I should resize and re-up that picture, it's 4400x2475!

Well the boat tailing behind should still help with the wake right? I mean why else would the vw xl1 do it or even the new light year one/zero? Heck even the second or third gen Prius did boat tailing behind the rear wheels, and the aero civic does it too

[Phase]

Been reading a ton of aero studies and recent journals from the last few years from aero engineers. Cutting edge stuff. One journal was mentioning a short 12-15 degree taper at the rear can reduce wake size and increase base pressure at the rear. Another study was done using box cavities that were short and also controlled the wake and increased base pressure. And another study I saw actually compared a short tapered box cavity was actually MORE EFFECTIVE than a filled in boat tail for reducing drag ( it didn’t explain why, I’m just guessing because theres no solid mass for the air to pull back on with the “ suction affect”?)

Many newer suvs are adding very small tapered box cavity edges on the sides of the rear glass and go up to the roof spoilers if you notice. One of the lead aero engineers at Land Rover was mentioning in an aero paper than they can’t make long tapers or cavities due to styling and design and “ practicality for a real world road car” but admitted how powerful the tool is for reducing drag

So pretty much I’m working on a few mock ups for rear cavity tapered edges. Flared fins that follow the OEM shape, can give a maybe more sporty look? And will extend the rear and taper the edges to reduce wake size and base pressure. Final version will be a bit longer than the current photos, and using abs plastic and be permanent. A benefit of these would also be for when I do make a removable boat tail, the slightly flexible abs plastic flares can be used to go over the edges/start of the boat tail extension to “ seal” the gap.

[freebeard]

That would make a good inner wall. The outer wall should follow the bumper cutline and then drop vertically to the kink in the skirt's edge and the tire 'boat tail'. IMHO, of course.

I like skegs.

[Phase]

Made a little update talking about the car

https://youtu.be/ARjnhJ2NjU8

[Phase]

https://youtu.be/WM536cDjHxk

Did a neighborhood test with these. Stable at 55 mph. Will be making some black and stiffer ones a little longer next with foam board. Will test interstate speeds with those. And final version will be permanent attachment and made of abs plastic

[freebeard]

Forum needs a Rotate Image button.

[Piotrsko]

I would think that causes vortices on the back side of the cardboard.

Better or worse? I dunno.

[Phase]

Originally Posted by Piotrsko

I would think that causes vortices on the back side of the cardboard.

Better or worse? I dunno.

Super sharp separation edges and box cavities like that increase pressure on the rear. Vw xl1 and Mercedes EQXX do similar things. Many Toyotas do a partial and shorter version. And almost every modern suv does it on the sides of rear glass now

Even some semi trucks have an extension like that that opens up

[Piotrsko]

But the issue is it is situation dependent on a case by case basis. Might work as planned, might not. I know I don't have enough compute power to predict it accurately.