Future APR aluminum wing

[i3igpete]

Upcoming dual element APR wing looks to more than double the downforce of the current GTC300 wing. simply incredible, will be great for competitive autocrossers!

1000+lbs of downforce at 120mph, the current GTC300 can only generate 450lb at that speed.

http://www.amb-aero.com/files/APR004_public.pdf

if this really gets made, they will likely need to make it out of steel to not crumble under it's own downforce. no trunk mounting for this thing!

[DocWalt]

Just read through the linked document... That wing looks pretty badass.

Do you have a comparison handy to compare drag:downforce levels to a GTC300 wing?

[i3igpete]

MPH:downforce:drag (all in lbs force)

GTC-300 numbers at 12* angle of attack
80 : 203 : 30
100 : 318 : 47
120 : 460 : 69
So the GTC 300 falls somewhere around 15 degree flap angle for this new wing.


GTC-500 numbers at 10* angle of attack
80 : 149 : 27
100 : 231 : 44
120 : 345 : 63
So the GTC 500 is nearly equal to this new wing with a 10 degree flap angle

[Nationalmilkman]

I was looking into a few wings with the similar design just last week. You would have to mount this like the Gran Touring car, to the chassis through the bumper or something like that. That's some massive down force, you should be able to throw in into a hard turn and stick it without a second thought!

[IPD]

why not trunk mounting? at least on the 3/s hatch, the mounts should be pretty stiff--assuming it's mounted in the stock location. the lip that the stock wing mounts on is immediately adjacent to a structural support; and actually sits atop the sides when the hatch is closed.

i can understand if you had a conventional trunk, gutted, and there was no support underneath (in which case you'd have to fabricate some kind of brace from the trunk to the floor). i just don't see that problem with the 3/s.

[Nationalmilkman]

Even the stock mount holes are on the lip/edge of the hatch and 1000lbs of down force can't be held by that little sheet metal.

[IPD]

well i doubt you'd want to run it there anyway. technically, the best place to apply downforce is centerline over the wheels. in the case of the 3/s, that means immediately aft of the 3kgt sails.

since that's logistically a nightmare, the hatch remains a good alternative. what this translates into is a need to adjust front downforce accordingly to compensate for the rear wheels acting like a fulcrum for the rear aerofoil.

if 1000lbs of downforce is too great for the stock location, one could either attempt to brace that location to the sides of the hatch (and add additional bracing under each side)...or one could mount the aerofoil closer to the center of the hatch & add bracing directly beneath the hatch, pressing against the floor of the hatch.

[i3igpete]

if 1000lbs of downforce is too great for the stock location, one could either attempt to brace that location to the sides of the hatch (and add additional bracing under each side)...or one could mount the aerofoil closer to the center of the hatch & add bracing directly beneath the hatch, pressing against the floor of the hatch.

You know those those ribbed support pads on the sides of trunk that support the hatch, and those screw height adjusters? those need to be stiffened otherwise you will damage the latching mechanism. i may already have something in the works for that.

that's assuming the sheetmetal on the edge of the hatch doesn't bend. It's already pretty strong because it's double thickness, but I dont know if it's 1000 lbs strong.

[MR2]

I'd just use the stock side supports to make it look normal, with another brace that comes up from under the rear toe hooks to bolster it.

now I just want them to make me one with 3 and 4 elements

wonder how their research went with more elements, according to that doc they we're allowed total control over the amount of elements....so why not more?

and they say budget.....what's budget to them ?

[i3igpete]

i'm actually passing PM's back and forth with the guy. my guess is that because of how well they got the 2 element wing to work, nobody is gonna need THAT much downforce.