How effective would the rear wing be on the below car? I imagine that the flow over/through the cabin would be very turbulent and not do a whole lot of good and would it be better with or without a windscreen?
In this example the exhaust is routed below it so it is hopefully in effect a blown wing, but would raising it into cleaner airflow and taking away that feature be better?
Thanks,
The blown area would only be (relatively) behind the exhaust, but the whole wing will be in dirty air. I'd raise it up out of the turbulent air.
If I read the intent in your main thread correctly that this is mostly a design exercise, then the wing is fine where it is currently placed.
As an aero guy, I have thoughts. Looking at the overall layout the rear wing is too far forward. Move it aft to help with some of the front downforce the body is going to generate. The blown bottom surface between the pylons will help offset some of the dirty flow across the top surface from the cage/airbox/windshield. Yes run a windshield, bugs and rocks hurt... The outer end will do what they are going to do fairly well as the flow rolls inward around the cockpit/engine. In a best case the center of the wing would be modeled with less aggressive angle of attack to account for the flow over the center rolling down toward the rear of the car.
Look for cars like the Ferrari 333SP for inspiration on a similar platform. There were others that competed in the series called World Sports Car from the early 90s to the beginning of the 2000s that all had the same basic layout (open cockpit, rear engine, ducted rads, rear wings). These most closely resemble what you have modeled.
Blown aero has some disadvantages, primarily being your downforce changes with how much hp you're making at the moment. This is worst at highspeed corner exits where you may need to lift which then cuts some of that downforce.
This assumes that the exhaust is making a significant difference though. As a first estimate, calculate the volume and flow rate of the exhaust (not hard) and compare that to the volume and velocity of air going under the wing. Is it doubling the air or adding 0.1%? If your gut tells you the number is too small to matter, moving the wing up (within the rules) is a no-brainer.
What is that giant tank on top of the engine though? Intercooler? If there's any way you can move that away from the airflow, both your drag and your downforce would improve, and it is rare to get both like this.
stafford1500 said:If I read the intent in your main thread correctly that this is mostly a design exercise, then the wing is fine where it is currently placed.
right now it is somewhat of a design study, however if i get the chance to built it I will.
the reason for the placement of the wing is that is where the chassis ends, but extensions are not hard to do.
Thanks, will check those cars out.
In reply to cyow5 :
yes, all valid points, I just figure it can be driven to suit that characteristic as a benefit>cost situation.
the tank is two water-air intercoolers, the engine shown here is just an example I pillaged from another car and is configured for 1600hp, real world expectations is probably a junkyard big block with ebay turbos and side intercoolers, I have tested multiple diffenerent engines for size.
In reply to stafford1500 :
how much benefit would the extra long endplates like on the ferrrari contribute? I assume it is to clean up flow under the wing?
A current example of what stafford1500 is talking about.
In reply to Mugglesworth :
Larger end plates will help the wing work better. You can try to incorporate the end plates into the bodywork sides to give the wing more support. You don't need to extend the endplates very far behind the rear edge of the wing.
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