Still thinking out loud. What if you thin out the canard a little in the direction lateral to the car. Then bring the leading edge either close to or touching the deck of the splitter. Then slope or rake the canard to try to blend it's trailing edge with the flare as much as possible within the rules.
Still fixated on trying to smooth the flow around that big meaty tire, especially below the flare. Anyone have a wind tunnel? |
I like the idea but .....
Is eliminating the tire drag a worthwhile trade off at autocross speeds? I spend a lot of a run with the tire turned anyway, so there is likely a lot of the tire that will be "out in the wind" even if I could effectively shield it in a straight line. Next year when I cage the car and go faster and straighter for longer it may be more of an issue. Keep the ideas coming:skid: |
Originally Posted by Chris Swearingen
(Post 517849)
I like the idea but .....
Is eliminating the tire drag a worthwhile trade off at autocross speeds? I spend a lot of a run with the tire turned anyway, so there is likely a lot of the tire that will be "out in the wind" even if I could effectively shield it in a straight line. : as you know, at autocross speed, it has to be a BIG wing, and BIG splitter for it to matter, even then, very little. canard really does nothing at these speed imo. it doesn't do much at higher speed either (100mph). they are used for tuning. |
Originally Posted by bellwilliam
(Post 517919)
it is not tire drag (at autocross speed) as much as the lift generated by tires. it is true that tires are turned away. but with tire spat, instead of 100% of tire treads not shielded, you have may be 50% of tires shielded.
as you know, at autocross speed, it has to be a BIG wing, and BIG splitter for it to matter, even then, very little. canard really does nothing at these speed imo. it doesn't do much at higher speed either (100mph). they are used for tuning. |
tuning as bigger or smaller canard. some race car use fender size as a tuning device, but it is for 100MPH+ adjustment. I doubt anybody can feel a canard adjustment at 60mph.
Imo, canard adds down force in a Miata, not by the force generated by the device, but from acting as a tire spat, that blocks out air hitting bottom of tires, creating tire lift (which is worse than body lift). in your case, I would design the canards to block out as much of front tires as possible. both to the side and bottom if possible. |
Originally Posted by bellwilliam
(Post 518281)
I doubt anybody can feel a canard adjustment at 60mph. Imo, canard adds down force in a Miata, not by the force generated by the device, but from acting as a tire spat, that blocks out air hitting bottom of tires, creating tire lift (which is worse than body lift).
in your case, I would design the canards to block out as much of front tires as possible. both to the side and bottom if possible. |
You've also got to remember that there needs to be support behind the canard. If not, all the force on it is just going to translate to flexing the bumper cover.
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Originally Posted by turotufas
(Post 518349)
One of my favorite images from SCC. Aint picked up modified yet, maybe next year. GRM is #1 right now I think.
www.motoiq.com |
Thanks for the above link... Didn't know they moved to that site (well quite a few of the writers/editors).
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SCC was totally liquidated. Modified got a few contributors and things like the USCC. So its not quite as gay as it used to be. I still refuse to read it do!
That website is cool as shit though. Reminds me of my Nissan days. Eric Hsu, Dave Coleman, and Mike Kojima. Awesome! |
4 Attachment(s)
Originally Posted by turotufas
(Post 518349)
I like the way you think. I never considered the effect that the tires have on the aerodynamics of the car due to them sticking out behind the bumper.
here are some ugly canards, but idea is to use it as a tire spats. front tire is 13.1% of total drag: http://autospeed.com/cms/A_2455/article.html an article on dive plane http://www.reverie.ltd.uk/Downloads/Aerobytes-Oct08.pdf |
Originally Posted by Braineack
(Post 517804)
Canards
http://image.modified.com/f/tech/173...tc+canards.jpg Nissan Skyline Gtr Jgtc Canards First, the canard redirects the oncoming air's momentum upwards, which causes a downward force on the canard. This is only moderate, since the velocity near the skin is significantly slower than in the free stream. |
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