Aerodynamic Discussion Thread
02-27-2013, 02:09 PM
#65
Elite Member
iTrader: (15)
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,847
Total Cats: 27
If you ask him, all the mass comes from muscle.
Some say that the densities of his muscles rival depleted uranium. And that he is listed as a ITAR sensitive weapons system as a result. All we know is, he's called The Hustler.
Some say that the densities of his muscles rival depleted uranium. And that he is listed as a ITAR sensitive weapons system as a result. All we know is, he's called The Hustler.
Reply
0
0
03-01-2013, 10:29 PM
#69
Senior Member
Thread Starter
Join Date: Oct 2011
Location: The Race Track & St Pete FL
Posts: 638
Total Cats: 57
Ok let keep on track
It is hard to tell, do to you would need wind tunnel testing to get definite a answer. Your question is also vague, at what speed 100, 120, 160mph... Higher the speed the more downforce and drag. Even if you know what speed, no one would really have an answer for the downforce numbers
It is hard to tell, do to you would need wind tunnel testing to get definite a answer. Your question is also vague, at what speed 100, 120, 160mph... Higher the speed the more downforce and drag. Even if you know what speed, no one would really have an answer for the downforce numbers
Reply
0
0
03-02-2013, 09:47 AM
#71
Senior Member
iTrader: (1)
Join Date: Dec 2008
Location: Manassas, Virginia
Posts: 1,242
Total Cats: 57
Ok, ok. What I was trying to ask was, which miata has the most time, money, and r&d in; not really physical downforce numbers. The s13 with the huge diffuser designed by the ex McClaren guy is what prompted me to ask. Also, I've never seen a miata at the WTAC so I was wondering if there are some race teams doing legitimate cfd or wind tunnel development. (Disclaimer: I know the WTAC isn't the only show in town and that Emilio and possibly autokonexion do some of this kind of stuff)
Reply
0
0
03-02-2013, 09:51 AM
#72
I have about 40 hours of CFD into my wing. The number I was getting from the CFD put it near the top of the heap for a wing in SSM around the 400lbs @ 60mph range. No idea for the full car because I havent had time to start trying to take one of the existing models of the whole car and convert it into a format I can edit.
Reply
0
0
03-02-2013, 05:32 PM
#74
Junior Member
iTrader: (2)
Join Date: Aug 2009
Location: Chaparral, New Mexico
Posts: 200
Total Cats: 9
What would be a ball park price to have custom uprights machined. I bought a gtc-200 local, but has the super short mounts. I used the template ThePass made for his and put it into slid works and made it into a 3D image.
Wouldnt a machinest just need the file to make the data points and put it into a cnc? Or would it be cheaper another way? I can upload the file if anyone is interested in it.
Wouldnt a machinest just need the file to make the data points and put it into a cnc? Or would it be cheaper another way? I can upload the file if anyone is interested in it.
Reply
0
0
03-03-2013, 11:14 AM
#76
Junior Member
Join Date: Dec 2012
Location: Indianapolis
Posts: 74
Total Cats: 45
I have about 40 hours of CFD into my wing. The number I was getting from the CFD put it near the top of the heap for a wing in SSM around the 400lbs @ 60mph range. No idea for the full car because I havent had time to start trying to take one of the existing models of the whole car and convert it into a format I can edit.
When I was working on my wing design, I did the 2d analysis in matlab using the pannel method. Now I have connveted my code to octave (free program like matlab). I did the 3d analysis in OpenFOAM. Just curious, what turbulence model did you use?
Reply
0
0
03-03-2013, 10:18 PM
#77
I was using COSMOS because its easier. a good 1/4 of that time I was using the wrong conditions and did mostly 2d stuff. I only used 3d to figure out the end plates. I'm wacking 70 pounds off of what the cfd gave me for the real version not quite being perfect, the wing supports that werent factored in, and the effects of the car. I'm probably being generous. I'm going to be moving to doing analysis in openFOAM once I have time.
Reply
0
0
03-03-2013, 11:01 PM
#78
Senior Member
iTrader: (4)
Join Date: Aug 2010
Location: Farmington Hills, MI
Posts: 460
Total Cats: 15
Ok, ok. What I was trying to ask was, which miata has the most time, money, and r&d in; not really physical downforce numbers. The s13 with the huge diffuser designed by the ex McClaren guy is what prompted me to ask. Also, I've never seen a miata at the WTAC so I was wondering if there are some race teams doing legitimate cfd or wind tunnel development. (Disclaimer: I know the WTAC isn't the only show in town and that Emilio and possibly autokonexion do some of this kind of stuff)
Reply
0
0
03-03-2013, 11:05 PM
#79
Junior Member
Join Date: Dec 2012
Location: Indianapolis
Posts: 74
Total Cats: 45
I was using COSMOS because its easier. a good 1/4 of that time I was using the wrong conditions and did mostly 2d stuff. I only used 3d to figure out the end plates. I'm wacking 70 pounds off of what the cfd gave me for the real version not quite being perfect, the wing supports that werent factored in, and the effects of the car. I'm probably being generous. I'm going to be moving to doing analysis in openFOAM once I have time.
Reply
0
0
03-04-2013, 04:43 PM
#80
Senior Member
iTrader: (1)
Join Date: Dec 2008
Location: Manassas, Virginia
Posts: 1,242
Total Cats: 57
I figured Matt's car would be up there. Why is it beneficial to ditch the back glass? I would think that glass would smooth the flow of the air going over the roof, down the glass, and spilling over the rear quarters and under the wing.
Reply
0
0
