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Old 12-04-2020, 02:57 AM   #21 (permalink)
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Quote:
Originally Posted by serialk11r View Post


They've had these since the E90 generation on most of the cars. I assume it must be useful.
I'd not seen that before. Very interesting.

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Old 12-04-2020, 01:36 PM   #22 (permalink)
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It reminds me of the half-tube on the bottom of an F1 front wing endplate. It looks like the half tube starts a tight vortex down the middle of the loose vortex developed by the mirror body.
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Old 12-04-2020, 08:12 PM   #23 (permalink)
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Very interesting seeing all the testing you do.
Thanks for sharing the results with all of us.

I have been away from the forum for ages, and am just now seeing this test.

I tested an A pillar extension recently, but this was just to see how large you would have to make something like a ( aerodynamic ) fence before you could control the flow of air.

I remember the Plymouth Superbird had a chrome piece that fitted to the A pillar.
I have seen it refered to as a " wind deflector ".

I noticed the new Toyota Camry has a built in VG near the mirror.
Surely this is not a new idea.
Why are car msnufacturers just now doing it ?
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Old 12-04-2020, 08:25 PM   #24 (permalink)
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Quote:
Originally Posted by Cd View Post
Very interesting seeing all the testing you do.
Thanks for sharing the results with all of us.
Thanks.

Tuft testing is always a favorite but the most consequential testing I do is directly measuring aero pressures on panels, and the throttle stop technique for measuring changes in drag (applicable to cars with mechanical throttles).

Do all those three and the need for guesswork and rules of thumb basically disappears.

Add to that direct lift/downforce testing and a little more guesswork is then no longer needed.
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Old 12-06-2020, 06:34 AM   #25 (permalink)
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I would have tried to build it otherwise ...
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Old 12-06-2020, 09:42 AM   #26 (permalink)
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Julian, I noted that your best results came from a 17 mm inlet.
I planned to use some thickwalled Coroplast ( 4mm ) and use the built in ribbing to direct airflow, but now see it will be far too small.
I could sandwich the Coroplast till I get the correct thickness, but I see you also had a smaller outlet diameter.
So I guess that won't work.

I wanted to ask if the Gen1 Insight has raised channels along side the windshield like my Civic does.
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Old 12-06-2020, 11:17 AM   #27 (permalink)
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I have noticed a protruding ridge on the A pillars of some modern cars.
I think the approach is an attempt to channel air towards the roof rather than flowing over the A pillars towards the side windows. At least the high pressure zone over the windshield should be deeper this way allowing for a smoother airflow over the hood and windshield.
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Old 12-06-2020, 12:20 PM   #28 (permalink)
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Quote:
Originally Posted by RedDevil View Post
I have noticed a protruding ridge on the A pillars of some modern cars.
I think the approach is an attempt to channel air towards the roof rather than flowing over the A pillars towards the side windows. At least the high pressure zone over the windshield should be deeper this way allowing for a smoother airflow over the hood and windshield.
Any cars in particular that you have seen that have this ?
( Or a photo pehaps )
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Old 12-06-2020, 01:32 PM   #29 (permalink)
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Quote:
Originally Posted by Cd View Post
Any cars in particular that you have seen that have this ?
( Or a photo pehaps )
Just one example, the 2020 Hyundai Elantra:

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Old 12-06-2020, 03:24 PM   #30 (permalink)
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@Vman455, that edge is specially designed to prevent water going from the windshield to sides.

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