12-04-2020, 02:57 AM
|
#21 (permalink)
|
Banned
Join Date: Nov 2017
Location: Australia
Posts: 2,060
Thanks: 107
Thanked 1,605 Times in 1,136 Posts
|
Quote:
Originally Posted by serialk11r
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.
|
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
12-04-2020, 01:36 PM
|
#22 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,720
Thanks: 8,151
Thanked 8,933 Times in 7,375 Posts
|
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.
__________________
.
.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________
.
.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
|
|
|
12-04-2020, 08:12 PM
|
#23 (permalink)
|
Ultimate Fail
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,585
Thanks: 2,872
Thanked 1,121 Times in 679 Posts
|
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 ?
|
|
|
12-04-2020, 08:25 PM
|
#24 (permalink)
|
Banned
Join Date: Nov 2017
Location: Australia
Posts: 2,060
Thanks: 107
Thanked 1,605 Times in 1,136 Posts
|
Quote:
Originally Posted by Cd
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.
|
|
|
12-06-2020, 06:34 AM
|
#25 (permalink)
|
-----------------
Join Date: Jun 2009
Location: Romania
Posts: 128
Thanks: 23
Thanked 57 Times in 44 Posts
|
I would have tried to build it otherwise ...
|
|
|
12-06-2020, 09:42 AM
|
#26 (permalink)
|
Ultimate Fail
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,585
Thanks: 2,872
Thanked 1,121 Times in 679 Posts
|
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.
|
|
|
12-06-2020, 11:17 AM
|
#27 (permalink)
|
Master EcoWalker
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,999
Thanks: 1,714
Thanked 2,247 Times in 1,455 Posts
|
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.
__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
|
|
|
The Following User Says Thank You to RedDevil For This Useful Post:
|
|
12-06-2020, 12:20 PM
|
#28 (permalink)
|
Ultimate Fail
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,585
Thanks: 2,872
Thanked 1,121 Times in 679 Posts
|
Quote:
Originally Posted by RedDevil
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 )
|
|
|
12-06-2020, 01:32 PM
|
#29 (permalink)
|
Moderator
Join Date: Feb 2012
Location: Urbana, IL
Posts: 1,939
Thanks: 199
Thanked 1,805 Times in 941 Posts
|
Quote:
Originally Posted by Cd
Any cars in particular that you have seen that have this ?
( Or a photo pehaps )
|
Just one example, the 2020 Hyundai Elantra:
|
|
|
The Following 2 Users Say Thank You to Vman455 For This Useful Post:
|
|
12-06-2020, 03:24 PM
|
#30 (permalink)
|
-----------------
Join Date: Jun 2009
Location: Romania
Posts: 128
Thanks: 23
Thanked 57 Times in 44 Posts
|
@Vman455, that edge is specially designed to prevent water going from the windshield to sides.
|
|
|
|