CFTP wing angle of attack number request...

[Epiphany]

I have a project going on and am looking for some data. I need to obtain AOA numbers for the CFTP wing with the vehicle at rest on a level surface. I have some CAD numbers but need to verify from an actual CFTP car. If any CFTP owner can do this I'd greatly appreciate it. And while I'd love to get the numbers for each of the two available settings, if you can only supply one number I'll do my best with that but just need to know which one it is (the more aggressive or less aggressive setting).

I measured it on an actual GT4 car a couple of days ago. Note that there is a much wider range of adjustment on the actual GT4 car but again, I'm just trying to find out what the CFTP angles are. Here's how it was measured, a straight edge was placed across the airfoil section longitudinally and an angle finder was placed atop it...

I'd also be interested in the winglet/end plate angles for a given AOA. This was what the GT4 wing was set to...

Any CFTP owners out there with a straight edge and an angle finder?

Sponsored

 

[Tomster]

Yea, I'll get that for you. All you had to do was text me.

 

[Tomster]

Here ya go.

To be sure this is an apples to apples, you have to also verify the camber of the wing as well as geometry.

The first photo shows the floor is essentially level.

The next is the angle of incidence.

 

[kilobravo]

Thanks, Tom and Tob, I woulda, but I ain't got no stinkin' digital angle-o-meter. <grin>

WAIT! I misspoke, I DO have one of those chingassos on the darn PHONE! No doubt I'd get the same number as Tom though. But, I do believe he is correct if you want the no kidding, exact AOA, I think you need more info and cypherin'. However, if I understand your line of questioning, you're just trying to see the delta between the two cars and the straight edge and anglometer <smile> are all that's needed.

KB

 

[Tomster]

Max depth occurs at about 6.75" from leading edge @1.42" deep

 

[Epiphany]

Interesting Tom. for that matter, how wide is that section of the wing and what is the width from outside of winglet to outside of winglet?

KB, this preliminary data and I'm by no means looking to chart AOA at differeing (but relevant) ride heights.

 

[Tomster]

Maximum camber occurs at about 4.5" aft of leading edge and is about 2" deep referencing the leading edge.

 

[Tomster]

Interesting Tom. for that matter, how wide is that section of the wing and what is the width from outside of winglet to outside of winglet?

KB, this preliminary data and I'm by no means looking to chart AOA at differeing (but relevant) ride heights.

The wing is 62" wide end to end from the trailing edge of the end plates.

The wing width is about 11 7/8 and geometry is consistent. In other words, it is not a variable geometry wing (no twists)

 

[kilobravo]

Good job, Tom and Tob, copy all, that's what I thought. Too bad FP didn't give us an AOA gauge up front, huh?

KB

 

[Epiphany]

Huge help Tom. Thank you very much. This is exactly what I was looking for and gives me plenty to work with.

If it matters, I looked in CAD at a side view. I sketched a horizontal line beneath the wing and then ran another from AOA point to point to give me a number in degrees. Not sure if the 5* I saw correlates to the milder street setting or not.

 

[Tomster]

Huge help Tom. Thank you very much. This is exactly what I was looking for and gives me plenty to work with.

If it matters, I looked in CAD at a side view. I sketched a horizontal line beneath the wing and then ran another from AOA point to point to give me a number in degrees. Not sure if the 5* I saw correlates to the milder street setting or not.

The settings I sent you were the angle of incidence (for the wing track setting). Angle of attack is the angle of the airfoil in relation to the airstream. Angle of incidence is the angle that is fixed to the chassis. In aircraft, the angle of attack varies with the angle to the airstream. In a car? The angle of incidence is probably about equal to the angle of attack, because the car's deck angle really doesn't change much. In normal circumstances, the difference is probably insignificant. What does change is the speed of the airstream and resulting downforce, which makes me wonder if this has to do with the artificially induced 180 mph speed limitation. The faster you go, the more downforce. You reach a point that too much speed could result in too much downforce. Think about the load on those rear tires..... it could very well be detrimental.

Its a shame that Ford couldn't have created a system to maximize AOA at the lower airspeeds while streamlining the wing at higher speeds, vis a vis, an active wing.....

 

[Epiphany]

Trust me, when I saw those videos of the active wing on an S550 I was strongly considering something along those lines. I have no doubt it is what we see on high zoot S650 variants as we move forward.

 

[Tomster]

Trust me, when I saw those videos of the active wing on an S550 I was strongly considering something along those lines. I have no doubt it is what we see on high zoot S650 variants as we move forward.

That would make sense, because in this day and age, I see no reason for the fixed wing configuration.

 

[Epiphany]

Just wanted to thank KB for getting me some images, data, and more on the CFTP end plates. Thanks for your efforts my friend.

@kilobravo

 

[kilobravo]

Always happy to help, Tob...glad the data was useful.

Sponsored