Aerodynamic Discussion Thread - Page 37 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-15-2016, 10:09 PM   #721
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Here's an interesting build to check out...

The RP968 It's a bit of a thing... - Rennlist Discussion Forums



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Old 08-29-2016, 02:21 AM   #722
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Old 08-31-2016, 12:58 AM   #723
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Indeed!

So I might not have the DRS finished in time for MRLS, but I'll still have the wing on Morpheus..
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Old 09-25-2016, 06:38 PM   #724
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Been a while since being in here. Bought a 2016 ND Miata though so the development begins. Since I am an aerodynamicist, aero work is of course going to be first.

Overall Cp plot on the car. Cp is better metric to look at in my opinion than just pressure. Cp of 0 = freestreem pressure. Cp>1 = high pressure zone. Cp<1 = low pressure zone.
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Cp plot on miata with streamlines of the wall shear vectors (aka how the flow regime is acting on the surface)
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Underbody shot of diffuser development. Yes this has a simplified underbody as I will be doing a completely flat floor.
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Vortex forming at one of the strakes on the diffuser. This helps keep flow attached at higher angles of attack on diffusers
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Another vortex on the strake on the diffuser. Notice the low pressure in the core of the vortex.
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Streamlines off the rear of the miata
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Oh and here is the actual car
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Old 09-26-2016, 11:28 PM   #725
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Quick question for you guys. How important is shape/size of a splitter fence?
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Old 09-27-2016, 11:47 AM   #726
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much excite.
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Old 12-17-2016, 11:21 PM   #727
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Thread bump to provoke thought, memory and innovation.

Did anyone after all these ears, ever put together a decent CFD model, top and actual bottom (not just a flat) ?
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Old 12-31-2016, 10:58 AM   #728
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Quote:
Originally Posted by ThePass View Post
Yeah I understand that's it's not a nice pretty bubble of pressure inside like having the windows up, it's very turbulent, but the 'parachute' effect is an exaggeration - I don't think the guys who pulled the rear window out were seeing significant MPH changes at the end of straights, from what I have heard it was much more differences in wing performance.

I run a rear lexan window though, so I cannot comment from personal testing. I've considered doing some sort of quick disconnects on it such as Dzus fasteners so that I could do back to back tests.

How high the wing is mounted plays a big role in that too though. The APR GTC-200 for example mounts pretty low, and IIRC even with the 2.5" risers still isn't at the roofline, so the no-rear-window configuration might benefit those wings much more than it would for someone who has gotten their wing up higher..

-Ryan
spec Miata 2007 runoffs, someone with a cracked rear window removed it, picked up a bunch of mph. Instant protests/ban. They don't run wings so yeah, it reduces drag. After that happened, I've even read of enterprising SM racers running "floating hardtops", where side/rear attachment points are raised a bit so cockpit air can escape from underneath rear bottom edge of the top. Also got caught, instant ban. Flyin miata had a track car with a vented rear window, placed on lower lower third of rear plexi. Kept their wing low for lower drag with same downforce (compared to same wing but high mount) . I'm removing rear window to install a vented plexi same as the flyin Miata car. This is all with front windows down. Windows up still best as, pre cage, I gained 4-5 mph on the back straight at mosport. Almost 135 mph. I could probably figure out a way to attach side windows back on for racing but don't think the cockpit temperature issues will be solveable.

Last edited by endura; 12-31-2016 at 12:06 PM. Reason: sp
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