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Old 05-14-2010, 09:34 AM   #44 (permalink)
groar
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Join Date: Jun 2008
Location: Toulouse, France
Posts: 595

scenic - '01 renault scenic
90 day: 43.09 mpg (US)

megane - '97 renault megane classic
Diesel
90 day: 72.53 mpg (US)

dennisius - '06 Toyota Prius
Team Toyota
90 day: 69.27 mpg (US)
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Quote:
Originally Posted by Piwoslaw View Post
On the second picture (whole car) I can see some black lines on the windows. Are those tufts for tuft testing your airflow?
Great observation, that's it. Now they are used to entertain my son

My TODO contains a few films including one about these tufts.

I have been very surprised to see by how much the tuft is going up on passenger window, the angle is up to 45°.
I have some on the rear windshield and the more surprising is the lower center which is turning around like a clock needle... which I interpret as a detachment of the air flow. This is certainly due to the fact the upper part of the rear windshield is around 20° with horizon, while the lower part is around 30°.

From that same picture I tried to measure the angle between horizon and the lines from the C-pillar. The following data are the measures plus 0.68° which is the angle between the horizon and the picture (measured between the lower part of the circle which is drawn on the hubcaps).
  • rear of the miniback : 11.99°
  • front of the cover : 17.78°
  • rear of the cover : 12.27°
  • rear of trunk extension : 16.68°
  • rear of the trunk : 19.43°
And the trunk cover has itself an angle of 7.26°

The fact these measures to the rear of the miniback and the cover being both closed to 12° give me hope to feel a real improvement

Denis.
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Best Mégane tank: 1268.9mi @ 77.847 MPG(US)
2008/06-2011/10 saving:
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  • Diesel / Money: 42.17% = 2446.25€ = 3357.26$


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