Rear wing height ?

[lclevert]

For you guys with rear wings, how high are you mounting them in relation to the height of the roll bar? Mine is currently mounted such that the leading edge of the wing is about 2 1/2" below the top of the roll bar. Where should it be mounted to be in clean air and not in air disturbed by the roll bar? Should they be mounted way up high above the roll bar?

Opinions or suggestions?

Thanks

[Bob_n_Cincy]

For you guys with rear wings, how high are you mounting them in relation to the height of the roll bar? Mine is currently mounted such that the leading edge of the wing is about 2 1/2" below the top of the roll bar. Where should it be mounted to be in clean air and not in air disturbed by the roll bar? Should they be mounted way up high above the roll bar?

Opinions or suggestions?

Thanks

Iclevert
Here are some videos to help you come to your own conclusions.



I was thinking of moving the wing forward and using my raised roll bar as the pivot point of the wing. I would like to hear some opinions on this.

[Bob_n_Cincy]

here is another video

[Sgt.Gator]

Bob, for many race organizations the rear wing may not be forward of the centerline of the rear wheels. Also most require the wing to be lower than the highest part of the "roof". There is an exception for Wagons. Since an R has no roof I'm betting you could have a problem if the wing were higher than the roll bar.
Check the rules with whatever one you may participate in.
Finally, I'm not sure I'd want to worry about the wing flying around like a sword or chopping down like a guillotine if I ever did rollover.
From a downforce perspective it is an ideal location though.

[Bob_n_Cincy]

Bob, for many race organizations the rear wing may not be forward of the centerline of the rear wheels. Also most require the wing to be lower than the highest part of the "roof". There is an exception for Wagons. Since an R has no roof I'm betting you could have a problem if the wing were higher than the roll bar.
Check the rules with whatever one you may participate in.
Finally, I'm not sure I'd want to worry about the wing flying around like a sword or chopping down like a guillotine if I ever did rollover.
From a downforce perspective it is an ideal location though.

Thanks Gator, See you this week at PRI.
Bob

[FFRSpec72]

Mine is the height of the stands (APR GT200 Stands) and is set a 4 degree angle

[lclevert]

Thanks Bob. Looks like the FFR cars are mounted in a similar location, just below the rollbar.

Skip

[Rob T]

Mine is at 5 degrees down. Measured in the center of the wing, factoring in 4 degrees for the Gurney Flap. According to the APR website for the GTC-300 should be generating 289 pounds of downforce at 100 and 419 pounds at 120. Drag is 36 pounds at 100 and 52 pounds at 120 (in clean air, etc. etc.) Mine is about level with the roll bar. Here are some pics. IMG_3018.JPGIMG_3019.JPG

[lclevert]

I have the GT-250 wing that is straight across (same angle across entire wing). The APR site shows this to produce 166 lbs downforce at 120 when set at 5 degrees down. At 10 degrees down it produces 300 lbs downforce at 120. I'm not sure what is supposed to be the optimal range. I believe the FFR guys had their wing set as yours is on one of their test cars.

Skip

[RetroRacing]

in our opinion, you don't get that down force unless you get the wing out of the shadow of the role cage, due to the disturbed air off the cage. We have ours 2.5" above the top bar due to our Hump. Mounting it low, below the shadow of the cage would be best, but the two humps in the bodywork don't allow a clear shot for the air to speed under the element. Next build, I want to cut those off and smooth the rear deck, try a lower wing, blah blah