Slotted Gurney lip?

[GregoryJ]

I'm in the process of making some Gurney Lips for my car and wondered what the purpose is of having slotted or segmented Gurneys with the v-shaped jagged edge? I've notice them on the center portion of new FA front wings and the lower element only on the rear. Can anyone enlighten me?

Regards,
GregoryJ

[Jeff Read]

Same down force as if the gurney was the same heigth as the tall point with less drag.

[Michael Cannon]

In past wind-tunnel tests(both 40% and 50% models), we would see a good drag reduction for similar downforce. However, once these items were tested full-scale (on track) we lost appreciable downforce as well as the drag, often at a worse trade-off than simply reducing wing angle or gurney height. Reynolds effect...

So, my questions to you would be:

1) How many F-1 cars employ this style gurney?

2) Who does more (automotive) aero research and development than typical F-1 teams.

Refer back to question #1.

Hope this helps.

[HazelNut]

i've seen them used on a few f1 cars. Ferrari was using them on their flaps for a little while. My understanding was that they introduce a small amount of turbulence that essentially "fills in" a dead area behind an aero element, and by doing so it allows the airflow to re converge more efficiently and reduce drag.

But who knows. I threw on a the back of the defuser on my rf97 for ****s and giggles.

[Rick Iverson]

Fellas;

I sat in the corner trying to see this in my "minds eye", but no-go. Any close-up photos available?

Iverson

[Rennie Clayton]

Fellas;

I sat in the corner trying to see this in my "minds eye", but no-go. Any close-up photos available?

Iverson

Rick,

Refer to the gurney lip on the top wing of this sports racer:




Cheers,
Rennie

[lolaS2]

A bit more info from the S2 message board...
http://s2racing.yuku.com/reply/1272#reply-1272

[patrick_gannon]

For what it's worth, I got 2 brief glimpses of a serrated gurney on Hans Peter's rear wing (each time he lapped me). At least one pretty well developed atlantic is running a serrated gurney.

[BILL LOMENICK]

That is my sports racer in Rennie's post and from my data it reduced down force a lot with no increase in top speed.

Bill Lomenick

[wmunsey]

I have them on my FA, hard to say if it is an improvement but if nothing else, it keeps people from leaning on the rear wing.

Weldon

[tonyc]

If it doesnt reall help downforce without reducing drag it must be that the serrated edge is necessary for tearing off a piece of saran wrap to wrap up your leftovers after the lunch break at regionals..........

[gcuddy]

your energies are better spent on mechanical grip, even on an FA

[tonyc]

Excellent point!