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slow car 12-29-2017 04:55 PM

wing v duck tail, Real data anyone?
Hi has any one got factual data regarding adding a 60" wing or GT3 996 cup car wing above a duck tail? SC track car
Ie lap times? , Hill climb times? feel of the car ?

Thanks John

cstreit 12-30-2017 07:26 AM

Someone posted lift vs. downforce comparisons between the ducktail and the 3.8RS wing like 10 years ago... Its still here... Maybe you can find it with search...

kent olsen 01-03-2018 09:31 AM

Search Jack Olsen posts, I think he did some actual testing

Jack Olsen 01-03-2018 06:43 PM

I think he's talking about whether there is a quantifiable benefit from combining the two, like Porsche currently does.

I've always combined the two, and there's no doubt that adding a wing to a spoiler makes for a large gain in terms of downforce. But whether, and if, the two are interacting in a meaningful way is something I don't have data on. I'd have to A/B a wing with and without a spoiler down below it.

I do have some 'dust data,' which suggests a pretty large low-pressure area. But that's not very scientific.

I recently purchased GT Racing's GT3-style base for the air-cooled cars. I doubt they did any meaningful testing with it (although I have no idea). The thing I like about it is that I will be able to eliminate my cross-supports with it.

Trackrash 01-06-2018 01:31 PM

Jack, any noticeable drag or reduction on top end speed with that wing?

Tell us about your diffuser!

Jack Olsen 01-06-2018 01:56 PM

There's no doubt additional drag from the wing. But my top speeds on track are higher with the wing in place -- probably because I'm going through the corner before the straight faster. My highest speeds at Willow come when I have the splitter and side skirts reducing air under the car and the wing helping me through the turns that come before the long, fast sections.

But I've got no data on the real-world drag produced by the wing -- only theoretical stuff.

I copied an underbody piece that continued a flat bottom under the engine, but only as wide as I could get away with without compromising cooling. On track days, I add an extension and side skirts, which just bolt onto the original piece. No data on it, And while other people with just the cover piece report a seat-of-the-pants-sensed improvement, I can't say I can tell much of a difference. But it seems to carry a very low risk of increasing drag, and it's probably helping.

This is with the extension and side curtains attached. It's a single piece that rides to the track inside the car.

Bonus videos.

Diffuser POV, from below:

And the whole package in use:

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