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Old 10-24-2011, 07:18 PM   #1
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Default Rear wing cutouts?

I just finished the body for my Xray. What is the benefit/effect of cutting out the holes in the rear wing? Right now I left them closed.
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Old 10-24-2011, 07:35 PM   #2
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I have always kept them closed. I also wonder what would happen?

In thinking, it would decrease rear traction with holes open.
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Old 10-24-2011, 08:48 PM   #3
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In theory, it should increase downforce. Those holes function on the same principle as a multi tier wing in full scale racing. A multi tier allows the wing to maximize downforce at a wider range of speeds than a single tier wing is capable of. Each tier has a speed range at which it provides the best downforce. Each tier next to the other helps to bend the air around the other. Allowing some air through the wing will help to keep the air flowing smoothly around both sides of the wing. In a basic sense, when the air stops flowing smoothly around both sides of the wing, it is said to have "separated," which in aviator terms is a stall.
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Old 10-24-2011, 09:05 PM   #4
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I'm quite puzzled about this as well. Wings used on a car have an airfoil shape, thus produces downforce. Whereas an rc's wing uses a curve to re-direct the direction of the wind. So, I'm guessing the holes are not there to prevent airflow separation/stall?

I hope someone from Proline or such answers this.
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Old 10-24-2011, 09:29 PM   #5
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Glad you asked that question. I just finished a couple lids for my TC and was wondering the same thing. I didnt do it cause im lazy. I would think that if they say to cut them out, then you should. But who knows?
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Old 10-24-2011, 09:38 PM   #6
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The shape of the wings we use is to do with scale I'm guessing. At the speeds these cars go, as fast as that might be for the track size and car size, isn't all that fast compared to real cars. 50-70kmph for an rc, vs 250-300kmph for real race cars. It may be that normal say f1 type wings that are basically plane wings turned upside down may not work at these relatively low speeds. It looks like the tc wings more aggressive curve simply push the rear down by forcing the air up.

In terms of load, this would put more on the back, which takes away weight from the front, reducing steering. Isn't the theory that the Mazdaspeed6 body has more steering then the LTC-R? Could explain the holes in the speed 6...

In any case I'd love to hear from proline on this.
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Old 10-24-2011, 11:29 PM   #7
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OP, do you have photo examples of the types/sizes of holes you are thinking of drilling? I would say that it definitely varies if the spacing is wider and more in number).
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Old 10-25-2011, 12:25 AM   #8
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OP, do you have photo examples of the types/sizes of holes you are thinking of drilling? I would say that it definitely varies if the spacing is wider and more in number).
No drilled holes, there are oval slots molded in the rear wing that can be cut out.
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Old 10-25-2011, 02:26 AM   #9
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These cutouts. I did open them on the speed6 body I have.
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Old 10-27-2011, 11:57 PM   #10
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Originally Posted by gubbs3 View Post
In theory, it should increase downforce. Those holes function on the same principle as a multi tier wing in full scale racing. A multi tier allows the wing to maximize downforce at a wider range of speeds than a single tier wing is capable of. Each tier has a speed range at which it provides the best downforce. Each tier next to the other helps to bend the air around the other. Allowing some air through the wing will help to keep the air flowing smoothly around both sides of the wing. In a basic sense, when the air stops flowing smoothly around both sides of the wing, it is said to have "separated," which in aviator terms is a stall.

That was very well said, and makes sense now. I thought of it as a way to let the air pushing down on the car escape, letting less traction occur. But the way you explained seems more likely.

Since I have a few wings, I will try each and see how it does.

As a side note, The P37 wing has a 'bubble' in the middle of it that spans across the wing a bit. Is that a way to better direct airflow thus increasing traction and stability?
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Old 10-28-2011, 12:46 AM   #11
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I think I remember hearing that Dale once explained it as decreasing drag without decreasing downforce.
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Old 10-28-2011, 09:02 AM   #12
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These cutouts. I did open them on the speed6 body I have.
Basically... what happens is as speeds rise, more air flows through the holes. This decreases drag on the straightaway. However, the air does not lay as low on the body in the rear when you brake. So, the air hits the top of the spoiler creating downforce for that turn you need to take. It's a very simple way to keep speeds up on the straights and your downforce up in the corners. It won't be perfect for every track or every setup, but should work well in MOST conditions. Such an awesome idea that it makes me smile.
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Old 10-28-2011, 11:03 AM   #13
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All the theories are good in theory but not in practice.
Any time you try to move air about too much, force it to change its direction, split it into little channels, it becomes turbulent causes more drag and less downforce. You would be better of slimming the wing down if you were trying to decrease drag or go as big as allowed to increase downforce. But if anyone want to try the wing holes for themselves its easy enough just to stick a line of tape back over the holes if it doesn't work for you. Personally i though the car handled like the wing had fallen off with the holes.
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Old 11-08-2011, 03:20 PM   #14
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what's being used to hold the wing sides on? double sided tape, shoe goo, glue, etc...?

i also noticed that most of the overseas cars use the sides but here in the usa most do not, reason?
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Old 11-08-2011, 03:36 PM   #15
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i also noticed that most of the overseas cars use the sides but here in the usa most do not, reason?

Collective laziness..
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