MB EQXX Cd=0,1716 1000km in one charge

[aerohead]

1) After printing the plan-view photograph, and using the published length, here's a list of estimated dimensions and ratios for the car:
Length ( L) - 4630mm
Width ( W) - 1679mm
Height (H) - 1300mm
Body height (h) - 1180mm
Ground clearance ( GC ) - 120mm
Wheel-base - 2799.08mm
Maximum body width ( @ front axle ) - 1679mm
Minimum body width ( @ greenhouse maximum width ) - 1530.7mm [ the car is more narrow than Subaru Justy, Renault Vesta-II, SMART ED, VW Beetle, Chevy SPARK )
Secondary maximum body width ( @ rear axle ) - 1624mm
Greenhouse length - 3275mm
Greenhouse width - 1355mm
Forebody - 2441.4mm ( 52.73% )
Aft-body - 2188.5mm ( 47.27% )
Verjungungsverhaltnis ( V ) - 1.85363
Active diffuser elongation - 99mm
Wake area = 35% Af
L/H - 3.56153
L/h - 3.92372
L/W - 2.75759
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Ave - 3.41428
L/ sq-root of Af = 3.37562
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Dimensionally, the EQXX cross-section is similar to the 1992 Dodge Colt, 1990 GEO Storm, and 1985 Chevy Cavalier Z24.
Its length is similar to the 1988 Mercedes-Benz 300 CE.
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Plan-view boat-tailing - 1230mm ( 25.5% total body length )
Tire width - 185mm
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The EQXX contour matches the 1922 Wolfgang Klemperer basic half-body, Cd 0.15.
A long-tail, with low-drag diffuser would require 1320mm elongation.
With full wheel skirts, maybe Cd 0.143.
With wheel fairings, lower.

[aerohead]

The Lucid Air thought experiment led to this:
A) 166.6 Wh/mi drops to 141.1 Wh/mi
B) 11.89 bhp-e falls to 10.597 bhp-e
C) Road-Load drops from 11.296-hp, to 10.067-hp
D) 6- miles/ kWh improves to 7.08-miles/ kWh
E) 208.97-mpg-e climbs to 238.8-mpg-e ( gasoline )
F) 284.2-mpg-e ( diesel )
G) 620-miles range is extended to 708.6-miles
H) almost five (5) of these cars could drive on the electricity of one (1) GMC HUMMER EV

[Vekke]

Cool video I found on linkedin. https://www.linkedin.com/posts/roger...er_desktop_web

[aerohead]

It's unfortunate that D-B/M-B chose to showcase their most efficient vehicle surrounded by the least efficient gas outdoor heating fixtures, perhaps burning Putin's GazProm natural gas, as their Ukraine adventure unfolds.
Maybe M-B could use a continuity director.

[Vekke]

They successfully drove 1000km on one charge with pretty nice avg speed.

[aerohead]

* 87.398- km/h ( approx. 53.32-mph )
* Tesla Motors published that their 'sweet-spot' is 57-mph, level, no AC, calm.

[Piotrsko]

I can't see a Tesla driver being calm at 57 mph with no A/C. But YMMV

[MetroMPG]

Originally Posted by aerohead

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Dimensionally, the EQXX cross-section is similar to the 1992 Dodge Colt, 1990 GEO Storm, and 1985 Chevy Cavalier Z24.

I've read a few reviews of the EQXX in the popular auto press that praise the car's low Cd, but NONE of them ever mention that a significant contributor to its efficiency is that it's quite a small car (by North American standards).


None of them emphasize that: total aero drag = Cd * A!



One video of the car being driven showed an interior view of 2 people up front, and their elbows were practically touching. The rear seat appears to be even narrower. It's quite a small greenhouse.



I think the designers have done a masterful job designing the car to appear larger than it really is, absent other visual references.



In that way it reminds me of the VW XL1.

[aerohead]

It's actually a little smaller than Ford's 'mirrorless', 1985, Cd 0.137 Probe-V.
A smidgeon bigger than EV1, which was also Cd 0.137, modified for the closed-course land speed record in 1993. Also 'mirrorless.'

[Vekke]

Cd 0,193

Cd 0,177
WOW what a impact with the 170mm extended spoiler Cd now0,177 vs no spoiler 0,193-->8% savings with that tiny extension!!! seems that its important to have just one backswirl on the wake.