Making the Ioniq slippier

[aerohead]

Originally Posted by Phase

No. Full boat tail isn’t an option for practicality. You know how tight parking is in Portland.

Next mod is an eqxx style diffuser

Please bear in mind the perfectly workable 'extensible' tails of the 1930s.
They don't impact 'practical' length at all.
Some Americans are currently driving 266"-length vehicles, and spending $100,000 to get them, without any apparent hardship.

[aerohead]

I wouldn't consider Cd 0.22 as any paragon of low drag. One could make a car 10,000 different ways for a Cd like that.
Cd 0.09 would limit a designer's options.

[Phase]

Originally Posted by aerohead

I wouldn't consider Cd 0.22 as any paragon of low drag. One could make a car 10,000 different ways for a Cd like that.
Cd 0.09 would limit a designer's options.

I was just saying I noticed it used those horizontal side skirts. The bisimoto modded Ioniq also used the same type of side skirts to keep air from going under and to guide it over their rear fender skirts ( my fender skirts are more aero than theirs)

[freebeard]

One minute later ... after permalink #450

Jack Rickard's electric Spyder used about 180 Wh/mile. The 550 Coupe is significantly more efficient. That 550 Coupe would make an EXCELLENT shape for a highly fuel efficient go-fast machine,

Thanks for not forgetting Jack Rikard. This puts me in mind of Christopher Runge

My design for my panel van had side skirts. They were [to be] wood 2x6 held to the four jack sockets with bungie cords so the could drag on the ground andf rebound.

[Phase]

Found this study on deflectors and wheel housings

https://publications.lib.chalmers.se...512/250512.pdf

This would explain why the rear wheel covers feel more aero. It’s not just reducing wheel turbulence, separation and pressure and keeping attached air flow, it also reduced the wake size and increases wake pressure in the rear. So double wammy!

Also best height for front tire deflectors are 40mm

[freebeard]

I thought one of the best parts is Figure 1.2, relative contributions. 45% above the stagnation point, 25% below and 30% to the wheelweels.

[Phase]

Originally Posted by freebeard

I thought one of the best parts is Figure 1.2, relative contributions. 45% above the stagnation point, 25% below and 30% to the wheelweels.

What was also interesting was that covering both wheel wells is actually not the most effective way to lower drag

I found a few other new studies and cfd analysis papers on a host site, but they all are behind a paywall and require like a 40 dollar payment to read. Ridiculous. Stuff like that shoukd be public knowledge

I skimmed over one that just had the conclusion posted, said I’d have to pay to read the whole study, but it said in SHORTER diffuser, that a curved diffuser that goes steep actually has less drag that a straight and mild angle diffuser. Would explain why the back of teslas have the end of the diffuser curve up, versus extending out like the eqxx

[Vekke]

Originally Posted by Phase

Found this study on deflectors and wheel housings

https://publications.lib.chalmers.se...512/250512.pdf


Also best height for front tire deflectors are 40mm

that depends on your ground clearance. generally 40-60mm heigth is the optimal. if you make them curved d shape its different situation...

[aerohead]

Originally Posted by Phase

Found this study on deflectors and wheel housings

https://publications.lib.chalmers.se...512/250512.pdf

This would explain why the rear wheel covers feel more aero. It’s not just reducing wheel turbulence, separation and pressure and keeping attached air flow, it also reduced the wake size and increases wake pressure in the rear. So double wammy!

Also best height for front tire deflectors are 40mm

A 'best height' of 40mm may be limited exclusively to that particular test vehicle.

[aerohead]

Originally Posted by Phase

Found this study on deflectors and wheel housings

https://publications.lib.chalmers.se...512/250512.pdf

This would explain why the rear wheel covers feel more aero. It’s not just reducing wheel turbulence, separation and pressure and keeping attached air flow, it also reduced the wake size and increases wake pressure in the rear. So double wammy!

Also best height for front tire deflectors are 40mm

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I believe that the Technical University of Munich reported that the Driv Aer CFD model has a 9% deviation built into it, and you'd be cautioned to accept any data results on face value.