Carma concept improves Porsche aerodynamics with venturi tubes and internal spoiler
20 November 2007

Four aspiring car designers from the Institute Superieur de Design in France have come up with this proposal for a new, more aerodynamically efficient Porsche called the Carma.The design concept was produced in response to a brief to create a more aerodynamically efficient car that remained true to Porsche’s long-standing aesthetic and mechanical principals and traditions. That’s why the Carma features a mid-mounted flat-six engine and Weissach’s signature blend of gentle, unsullied curves.Underneath the car is where the Carma gets interesting. Instead of a flat underfloor it uses two venturi tubes which run the length of the car, and increase ground-effect, sucking the car down onto the road at speed.At the rear, the Carma’s designers have internalised its spoiler. Two portholes above the car’s engine suck air down under its skin as it passes over the top of the car. The same air is then channelled downwards and out of the rear of the car, counteracting rear axle lift.It’s interesting to see that designers Germain Baillot, Pierre Fichet Delavault, Julie Dicks and Simon Menu have created a rear end for the Carma that references the 1978 Porsche 928 coupe. The 928 is a car that, many have speculated, will be replaced in the not-too-distant future, using Porsche’s new Panamera saloon platform as a basis.For more on the Porsche Carma concept, including video footage, click here.

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20 November 2007

Can someone whose knowledge of aerodynamics is better than mine explain how ducting air *into* a car and pulling it down can possibly reduce lift?

Oh, and surely the tail is more reminiscent of a 928 S4 or GT?

22 November 2007

I like the design, it as the unmistakeable shape of a Porsche while moving the design theme on a little.

The only way I can describe the air being used to glue the car to the road is to think of an aircraft wing working in reverse, where the air flowing over the wing has further to travel than that going under the wing creating lift, use this principle in reverse and you have downforce.

The flat undertray on F1 cars with venturi's at the back creates negative lift, almost like a vacuum under the car sticking it to the track.

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