Aerodynamics - rear wings.....

[dubbedup]

I have a standard V1/2 big wing (not on the car currently) and am wondering if this will provide real aerodynamic aid/downforce or even if it is needed and what sort of speeds will it be effective???... also thoughts on a t wing style?

This may seeem like a bit of a silly question, so please, no flamage

[Joker]

IIRC they come into play over/after 60-80kph

T style wings work a bit like stock car style wings (over sized) the increase sideways drag in the event of a corner manufacturer... (stop back sliding out/drifting)

[pl0x]

i thought wings don't start working until 120k ish

[WRXER]

When I have some spare $$$ this is the one Im getting

Same as the one that is on BT's and WLDSTI's from Buddyclub.

From the theory I've read they don't really kick in til round the 140-160ish mark on actual downforce g's. Unsure on how the stock ones work or what speed they work around.

At this point haven't bought one yet as a) I need to get my car running first and b) more growth in better lap times due to experience then from downforce at this point.

[subieboy]

 WRXER said:

When I have some spare $$$ this is the one Im getting

ooh ooh that reminds me, when are these designers going to make covers to go over those fugly exposed metal riser footing bits???? GAaaaarrrrrrhhh

Back to topic, I vaguely remember reading something about WRX wings only being effective above the 120Km/h mark...

[dubbedup]

I wonder if i can take my wing down to th uni and see if they can test it for me???? i know the have some fancy shizz down there!

[Guest]

lol - you would need to take the whole car down not just the wing !

Your wing will produce abit of downforce and reduce drag abit.

[Joker]

Stolen: ^^and busted ^^ :]

 "Qwerty" said:

How good is the version 6 Sti wing ?

This is a graph of downforce vs wing thickness at different angles of attack @ about 180km/h. From the book competition aerodynamics.

We can clearly see that max downforce is created at around 18-20% wing thickness. At high angles of attack 16 degrees.

Note we don't have any values for "thin" wings at high angles of attack as they have stalled. For example the 8% thick wing has stalled at an angle of attack above 8 degrees.

Whilst the 16% thicker wing is not only making more downforce at 8% angle of attack its almost making double the downforce at twice the angle of attack.

Rough wing section of the verstion 6 sti wing.

As you can see its a high downforce style of wing.

Thickness 17.5%

Camber 12%

Angle of Attack - i guess arround 16 degrees

The Sti engineers have pretty much hit all the numbers to make a high downforce wing. Thick wing at a high angle of attack with lotsa camber.

If anyone has measurements / pictures for other sti / aftermkt wings post them up

and play here : http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html

[dubbedup]

haha, just got that link, cheers guys...

[Guest]

here is an article my wife wrote for a magazine about aerodynamics

maybe it might be helpful

http://www.mediafire.com/?wj2mmmzznin

[familyman]

Here is a cheap as (read: semi rangi) way to test.

Take off wing and bolt to firm non flexing anything.

Then place equal sized non flexing thing on boot of car.

Place accurate bathroom scales between non flexing things and mount. ( have not worked out this finer point yet.)

go for fast drive with video camera aimed at scales display. This will show you what speeds create what downforce.

Switch wings and compare away.

[5UBZRO]

 familyman said:

Here is a cheap as (read: semi rangi) way to test.

Take off wing and bolt to firm non flexing anything.

Then place equal sized non flexing thing on boot of car.

Place accurate bathroom scales between non flexing things and mount. ( have not worked out this finer point yet.)

go for fast drive with video camera aimed at scales display. This will show you what speeds create what downforce.

Switch wings and compare away.

Yep...... full rangi hahaha but acheiveable with plenty of duct tape.... Churrr. I can also say that hitting the picks in my car on the pit straight and back straight of manfield is a scary thing atm without a wing!!! GT-wing on its way....