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Old 08-15-2016, 11:09 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, 03:21 AM   #722
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Old 08-31-2016, 01:58 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, 07:38 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.


Cp plot on miata with streamlines of the wall shear vectors (aka how the flow regime is acting on the surface)


Underbody shot of diffuser development. Yes this has a simplified underbody as I will be doing a completely flat floor.


Vortex forming at one of the strakes on the diffuser. This helps keep flow attached at higher angles of attack on diffusers


Another vortex on the strake on the diffuser. Notice the low pressure in the core of the vortex.


Streamlines off the rear of the miata



Oh and here is the actual car

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Old 09-27-2016, 12:28 AM   #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, 12:47 PM   #726
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much excite.
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Old 12-18-2016, 12:21 AM   #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, 11:58 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 01:06 PM. Reason: sp
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