Mercedes says 0.20 Cd for EQS electric sedan is record best for a production car
1 Attachment(s)
https://ecomodder.com/forum/attachme...1&d=1617026432
(EQS concept and camo production cars.) UPDATE: scroll down a few posts for undisguised photos of the production car. Quote:
I wouldn't expect that's a significant aero benefit unless the car has laminar flow across the hood/fender transition, which would be unusual for a road car, no? Relevant aero detail or harmless styling exercise? Quote:
More pics at: https://www.autoweek.com/news/a35960...-aerodynamics/ |
Yes, really interesting car. But the article is a bit breathless - traditional 3 box shapes have been on the wane for, what, decades?
No I don't think that it will have laminar boundary layer anywhere - just a few bugs would destroy that. To my eyes the EQS just looks to be doing all the normal low drag things - full undertray, attached flow to back of car, clean separation edges at rear (hard to judge though because of camouflage), what appears to be a fairly aggressive rear diffuser angle. Hope, hope, hope they release a tech paper though - front and rear lift figures would also be very interesting. |
Quote:
Unlike the concept vehicle, it's got the usual horizontal hard edge at the rear of the deck lid, but no vertical separation edges on the rear corners as sometimes seen on other low drag cars. Here's a decent rear view even with the camo wrap: https://cdn.motor1.com/images/mgl/LZ...rburgring.webp Part of this set: https://insideevs.com/photo/5191843/...s-nurburgring/ |
8- counts lower than Tesla
So the EQS is 8-counts lower than the 2021 Model S Plaid. Easy to best in the next 'refresh' or slam, if a body-in-white redo of the long-in-the-tooth Model S.
I'm always happy to see lower drag. Hope they can catch up to the 1993 EV1 LSR some day. Or the 1997 M-B F300. |
undisguised car - more details
4 Attachment(s)
The company revealed the undisguised production version yesterday:
https://ecomodder.com/forum/attachme...1&d=1618581344 Notable: that deck lid spoiler is somewhat unusually narrow. https://ecomodder.com/forum/attachme...1&d=1618581391 The feature behind the rear wheel might be a pressure vent from the wheel well that aids separation at the back corner. We've seen that on a few production cars. Or it might just be there to trip flow from wrapping at the rear (or both). And of course the door handles are flush, which is seemingly now a required EV party trick - arguably popularized by Tesla. https://ecomodder.com/forum/attachme...1&d=1618581773 If you zoom in on this image, it looks like the outside of the side "vents" have a passage, possibly for a front wheel "air curtain". And while the front upper "grille" is smooth, the lower grille surprisingly does not appear to have shutters - doesn't that look like a heat exchanger visible in there? https://ecomodder.com/forum/attachme...1&d=1618582102 Mercedes’ press release about the car is 62 pages long! Relevant aero subsection: (aha - it mentions grille shutters...) Quote:
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What helps to get lower drag figures is ofcourse the air suspension. At the moment they haven`t told the at which ride heigth the 0,20 is achieved.
Also the turning rear wheels help little as front wheels don`t have to turn so much. More flat panels can be onderside of the car. Havent seen any pictures yet on the underside of the car, because most magic is there. |
Yes, there are a few asterisks on the specific options / settings required to reach 0.20
- Specific wheel/tire combination (possibly not the ones shown in the photos) - The ride height issue is hinted at in the press release where a specific "drive mode" must be selected for the lowest Cd. |
It is quite interesing to see a relatively "normal" shaped car reaching such a low CD.
After aerodynamic desasters such as the BMW i3 and Nissan Leaf (both 0.29) or Mitsubishi I-Miev (0.35) it's nice to see EVs getting shaped more aerodynamicly, like the EV-1 (0.19). After all, aerodynamic drag is THE factor for highway range. |
Sadly, the sedan is a dying vehicle format.
As you point out, we're unlikely to see 0.20 for a SUV/crossover body style. Unfortunately, that's the style of vehicle people overwhelmingly seem to want to buy and what marketing departments are pushing people to want to buy. |
I meant "normal shaped" as in not basjoos civic (0,17) or a Milan SL (0,076), but yea SUVs are just terrible.
They are like offroad vehicles on the road and like road vehicles off road while offering less space on the inside than wagons. Many even offer less space for tall drivers than the original Smart ForTwo. Plus they have terrible visibility, often ridiculously high weight and to load something into them, you need to lift it rather high first. What are they even good for? |
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