Browsing through some images of the last years crop of challenge cars I found an interesting re-purposed spoiler on the #5 mustang. I'd like to give this a go on a different car and maybe have a reason to use the 3D printer at work. What I'm curious about is what angle might be good for setting a spoiler like this? I'll be running this on a hatchback integra if that makes any difference.
How fast are you going? Which wind tunnel will you test your design? (a spoiler may not do what you think its going to) A flat one might work better. (look at NHRA Pro Stock) A diffuser might be more beneficial.
You don't need a wind tunnel to test aero mods.
If this is for Challenge speeds, you'll want it pretty steep. No need to make it contoured like that Mustang one, just a flat plate will do the job. Check out CSP autocross cars.
A horizontal setup will likely cut drag more than create any sort of downforce. Check out Competition Car Aerodynamics, you might find the sort of info you're looking for.
I'm not entirely sure, but I think the spoiler in the pic is the stock Mustang wing turned backwards and almost upside down. If so, neat idea.
Anyway, judging by the autocross spoilers I see, I think 60-75 degrees might be a good place to start.
I would be taking this car above challenge speeds, but it pulls double duty as an autocross car and track car. This year I'm leaning more towards track use than autocross.
Keith, thanks for the suggestion on reading material.
Make it adjustable man! Some brackets and hinges from ace hardware, a beer, and a little time on the Internet is all you need. (Notice I didn't say "ingenuity" that's because it lacks in this world, and all we end up doing is copying and improving.)
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