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Mercedes CLA sedan: 0.23 drag coefficient (0.22 for BlueEfficiency model)

From the MB press release:

Quote:

(Wind) resistance is futile - a new record Cd figure

With a Cd figure of 0.23, the CLA sets a new benchmark among not only Mercedes models, but also all series-production vehicles. The frontal surface area, Cd x A - which is crucial to aerodynamic resistance – also leads the field at 5.49 sq. ft.

The good air flow characteristics, which have a major impact on fuel consumption under everyday driving conditions, are the result of extensive aerodynamic optimization. These include

a low A-pillar shoulder with adapted A-pillar geometry,
aerodynamically optimized exterior mirrors,
low-drag wheel trims
and serrated wheel spoilers on the front and rear wheel arches.
Extensive underbody cladding,
additional cladding at the center of the rear axle,
an aerodynamically optimized muffler
and a diffuser improve the flow of air beneath the underbody.

Amazing! I guess that explains how the base CLA can crack 130 mph with just 122 hp and 150 with the two liter.

This is one Merc I can't wait to test-drive. After the horribly plasticky B-Class, it's nice that Mercedes is trying to find ways to go mass market (read: FWD) without losing its premium appeal.

Quote:

Originally Posted by MetroMPG (Post 351402)

From the MB press release:

And that trunk probably doesn't even hit template. Shows how the details can add up!

Yup: detail optimization can make up for a lot. Tells us how bad the "details" must be on most cars, doesn't it?

The brochure is fascinating reading.
http://www.mercedes-benz.fi/content/...7_0113_021.pdf

Wow - .22 for the high efficiency model, coming later. Editing the post title. :)

From the PDF:

Quote:

Aerodynamics have never looked better ... The result is a perfectly structured whole whose aerodynamics are unmatched in the series-production car sector.

– Cd value of 0.23 (0.22 for CLA 180 BlueEFFICIENCY Edition expected to be available from 2nd quarter of 2013) is the lowest for any series-production vehicle

Quote:

The impressive aerodynamic qualities of the new CLA ensure that it offers only slight air resistance, not just in the wind tunnel, but on the road, too. As a result, the expressive exterior design is accompanied by a Cd value of 0.23 – an outstanding achievement among series production vehicles and one which is second only to another model in the new CLA line-up: the CLA 180 BlueEFFICIENCY Edition (expected to be available from 2nd quarter of 2013) has a Cd value of just 0.22 thanks to the use of additional innovative technology.

How do you benefit from this? The optimised airflow around the vehicle plays a major role in achieving the measurable reduction in drag. The positive effects extend beyond a reduction in fuel consumption: low lift coefficients at the front and rear wheels make for agile handling, good driving stability at higher speeds and an assured response to crosswinds. The outstanding aerodynamics also make themselves felt inside the vehicle
where wind noise is reduced to a level unmatched in this category. All of which goes to show once again that, rather than being an end in themselves, good aerodynamic characteristics have lasting benefits in many different areas.

Funny, I have been noticing the Merc sedans lately.
Noticing how low the front edge is to the ground and how low the front hood is to the ground.
also how 'tight' the tires and wheels are to the edges of the wheel well.
Usually a sedan's bumber will clear a curb. Butthe newer merc arent high enough.
As Metro said....'opitmizing the details"!

Quote:

Originally Posted by MetroMPG (Post 351402)

From the MB press release:

MB proabably lurking here at ecomodder? How bout the belly?

Just as a reminder, Merc was the first to do 0.24 in a production car, just a few years ago:

http://ecomodder.com/forum/showthrea...html#post88383

And they seem to be getting closer to their goal:

Mercedes to Sell Super-Aerodynamic Cars in 5 Years