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Aerodynamic efficiency

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Old 02-08-2018, 09:19 AM
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Default Aerodynamic efficiency

So i have an Ap1 with Cr wing. I have played with the idea of making a DRS system. (note: i know ill never be going fast enough for it to work) I wanted to do it simply for the novelty of having it. However It got me thinking about aerodynamic efficiency. From my research, the CR wing works to reduce lift more than to create downforce. If my understanding is correct, it acts more as a spoiler than an air foil. Therefore, the ideal angle of attack is constantly changing with any given speed. The faster you go, the more vacuum above the rear of the car, thus creating the lift. Thinking of this i thought that instead of an electronically adjusted angle of attack, to have an air pressure adjusted angle. For example, the wing mounted on an upright with a pivot and the back of the wing being supported by a gas shock of x amount of force. I am not fluid dynamics engineer per so im wondering if there are any aero experts that want to chime in here?

Before anyone says its too much work for little to no gain; I have the time and means to make my own uprights. And thank you for any input.
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Old 02-08-2018, 09:34 AM
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Do it! Changing the pitch of the wing would seem a lot easier then adjusting the height anyway. Finding or building a ecu to control the pitch at given at set speed points might be the hardest part. But there are modern supercars with this tech so someone makes the programming/ecu.
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Old 02-08-2018, 09:48 AM
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I was actually going to manually adjust it with the switch for the convertible top since its no longer in my car. I work as an automation specialist so im sure I could program it to do that automatically but that definitely goes well beyond the amount of r&d that im willing to put into this lol
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Old 02-08-2018, 10:11 AM
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Originally Posted by CrimsonCore View Post
I was actually going to manually adjust it with the switch for the convertible top since its no longer in my car. I work as an automation specialist so im sure I could program it to do that automatically but that definitely goes well beyond the amount of r&d that im willing to put into this lol
If you want it to be really functional, it sort of needs to be automated. Reaching down to flip a switch as you are entering a corner each and every time takes focus and hands away from where they should be. In a situation where that wing would/could actually be the difference on making a successful turn at the track, last thing you want is to be manually operating it. Its simply a pointless pet project otherwise. I say take it to the next step and make it actually functional. Might sell a few.
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Old 02-08-2018, 12:19 PM
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I've been playing with the idea of doing this also. I have a racecapture pro in my car and that has outputs that could be used to control it and the ability to write code that runs on the box so you could really implement whatever automation you wanted. The hard part for me was finding actuators that were fast, had a range of motion, and aren't super expensive.
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Old 02-08-2018, 02:21 PM
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You could probably do it with an Arduino that has an OBD2 shield and a couple of RC car servos with linkage.
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Old 02-08-2018, 02:22 PM
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Old 02-10-2018, 06:38 PM
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Originally Posted by the-moss View Post
I've been playing with the idea of doing this also. I have a racecapture pro in my car and that has outputs that could be used to control it and the ability to write code that runs on the box so you could really implement whatever automation you wanted. The hard part for me was finding actuators that were fast, had a range of motion, and aren't super expensive.
Sounds like you two need to hook up and combine efforts!
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Old 02-10-2018, 10:00 PM
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Adjusting the wing without adjusting front downforce will leave the car unbalanced. Brake balance would also be affected differently at different speeds.

There are so many other aero projects that would have more effect. How efficient is your cooling system, a major source of drag and usually loss of front downforce? Or a front splitter with front diffusers? Or a rear diffuser? F1 and WTAC cars have concave rear diffusers starting in front of the rear axle.
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Old 02-10-2018, 10:37 PM
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Out of the box this car gains the most from having added down force in the rear. For aerodynamics to be a factor you need to generate some speed, input/directional change at speed causes inertia forces which causes the rear to let go first. Not saying you shouldn't address down force up front as well, an even balance is the best, but its certainly a worthy effort to add some in the rear if its going to happen anywhere.
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