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Gurney flaps?

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Wed Oct 07, 2015 3:33 pm PostPost subject: Gurney flaps?
Merlin
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Has anyone ever experimented with gurney flaps?

It has been suggested to me to remove my rear wing and replace it with a the OEM pedestal spoiler and add a gurney flap to it.

I am faster round KH with my bat wing on, but it does drag. I am looking to reduce drag while providing enough down force on the rear.
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Wed Oct 07, 2015 8:07 pm PostPost subject:
AK
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Graham *hollow pockets* fitted one to his noble a while back.

I think the theory is well known but I guess you should just give it a test. Even adding a flap and deeper end plates to current wing should reduce drag. Vortex generators on roof edge too
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Thu Oct 08, 2015 8:28 am PostPost subject:
Merlin
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Yeah I'm just going to try it out on this months TS track day.

I made a rough template for the gurney flap V1. Just as a concept to see what it will look like. The top edge on one side is a bit wobbly as I was free hand cutting it with a knife Very Happy





I have made a section that folds under itself to attach on to there the brake light screws in, the rest of it will be riveted to the spoiler.
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Thu Oct 08, 2015 9:12 am PostPost subject:
David Long
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Going back to my CPL training . . .

The gurney works by producing small counter rotating vortexes that 'stick' the top and bottom flows together for longer. Because the flap is just on one side, it also tends deflect the flow upwards. The net result is similar to a bigger wing with a slightly higher angle of attack. In theory you can therefore reduce the angle of attack of your bigger wing, to get the same force for less drag, but I suspect that would be marginal. The smaller wing with a gurney may work better but you might have to experiment to find the optimum size of flap - I think there is a formula for it somewhere.
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