Internal Body Aerodynamics

[mfain]

Nice work mfain! Thanks for posting the pics.

Thanks guys. I am working several new aero projects for the car and will post photos when able.

 

[BBShark]

Pappy -

Like to hear more about your Lotus 78/79 inspired side tunnels. I have had side tunnels in the SR side pods for about 3 years now. Built as 10 degree and 20 degree. Haven't"swept" with an airfoil section - just straight, flat ceilings. Butt dyno says it works well. Plan has foam and glass inserts, not built yet.

I had side skirts (Chaparral-style) and that was like the car was literally on rails. They were 2 inch aluminum, and Tech missed seeing them as we teched on grass. Pulled them after a weekend to stay "legal."

Faster motor? Maybe a servo is the answer. Placement of the control arm is key to keeping the loads down. On my back burner is an Active Aero module to be semi-autonomous, sort of wings level trim, that "paddles off" under acceleration (DRS) and under braking - increases. I'm sure we have some brighter EEs here than me.

I have planned a complete testing of some of the components ion the SR. It has been the Mule for the "vette mods, and once I get a few bugs sorted out and the test done - I'll share too.

Cheers - Jim

Hey Jim,

I have the tunnels/belly pan/diffuser off the car right now doing some undercarriage work, but I was able to take a couple of photos to show how the diffuser tunnels are set up. The sketch shows how the tunnels blend into a rounded leading edge that is actually an extension of the firewall. The area highlighted at the rear is the portion of tunnel that is shown in the following photos. Photo 2 shows the side skirt (under construction at the time of the photo) and the third photo is of the tunnel assembly with side skirt. The last photo shows the actual diffuser tunnel from the back looking forward - inverted wing profile with a 12 degree diffuser discharge angle (including vehicle rake).

View attachment 2385

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Incredible workmanship and engineering!

 

[rtj]

They say a couple of things that don’t really sit right with me, but it is interesting.

[ame]https://www.youtube.com/watch?v=3vVimm3y4Ig[/ame]

 

[rtj]

[ame]https://www.youtube.com/watch?v=u-adbpaDLw0[/ame]

 

[mfain]

https://www.youtube.com/watch?v=u-adbpaDLw0

GSpeed is building some interesting stuff. They are running a C8 and their in-house C5 in the Ultimate Track Car Challenge at the end of the month. This car has no cage (just a roll bar) so it can't run in the unlimited classes - that means it must be fairly heavy to stay in class with the high hp LME motor. It does have some interesting and probably effective aero. Look up GSpeed (Cresson TX). They have tried some wild aero stuff with their C5 and they usually run faster than the NASA T1 times with their T2, very detuned LS. They will probably show up at the UTCC with 600+ wheel horsepower.

 

[rtj]

GSpeed is building some interesting stuff. ......... Look up GSpeed (Cresson TX). They have tried some wild aero stuff with their C5 and they usually run faster than the NASA T1 times with their T2, very detuned LS. They will probably show up at the UTCC with 600+ wheel horsepower.

Looked them up on the web and checked out their Facebook page. Time attack is not in my budget, but looks interesting.

I thought this car was pretty well thought out.

 

[rtj]

Some details like active flaps in the front splitter, what appears to be wheel cooling fans, and double diffuser.

[ame]https://www.youtube.com/watch?v=4BqjVplGAHA[/ame]

 

[69427]

Some details like active flaps in the front splitter, what appears to be wheel cooling fans, and double diffuser.

https://www.youtube.com/watch?v=4BqjVplGAHA

WTF is with that guy's voice? I made it to 21 seconds, and then I had to exit the video.

Any cliffs?

 

[phantomjock]

CC ?

 

[rtj]

Some details like active flaps in the front splitter, what appears to be wheel cooling fans, and double diffuser.

https://www.youtube.com/watch?v=4BqjVplGAHA

WTF is with that guy's voice? I made it to 21 seconds, and then I had to exit the video.

Any cliffs?

You could turn off the sound, as he really just points out features.

Yes, the voice takes some getting accustomed to, but the cool features I noticed are:

the flaps in the splitter. I’m guessing at high speed on straight line they open to reduce downforce and/or reduce cooling flow(drag). Just a guess.

The outer wheel rim features scallops, which I assume means brake cooling fans and possibly more downforce. That Porsche got more downforce and brake cooling with theirs, granted it was differently designed.

The dual diffuser is there, not sure if they are better, or just allow room for transmission in such a dropped car.

The driving part I pretty much skipped. Oh yes big $$$$$!

 

[rtj]

Minimal aero, but the idea of 3D printing body part prototypes is interesting. Vette427sbc just posted some of his 3D printed prototypes in his thread. A whole new era of hot rodding is coming I guess.


[ame]https://www.youtube.com/watch?v=fz6YZ2HJBfk[/ame]

 

[rtj]

[ame]https://www.youtube.com/watch?v=wOidYnBE7vs[/ame]

Huge spoiler on the rear and the diffuser are interesting.

 

[vette427sbc]

Slightly off topic, but am I the only one that thinks the flares are "poorly executed" (putting it nicely) on that car?? The wing is cool, I imagine it has to be at least that tall to give any notable benefit with how dirty the air is on the rear deck of these cars. The diffuser probably cleans up the airflow quite a bit considering the rear is almost a parachute without the spare tire up there.

 

[rtj]

Slightly off topic, but am I the only one that thinks the flares are "poorly executed" (putting it nicely) on that car?

Functional, might be a reasonable description. One thing about flares, cut them off and screw on some of those extra wide ones from Duntov!

It was a newly posted video. I kind of liked it. Figured it was more appropriate than some of the big $$ stuff in other vids I have posted ( which I can’t afford ) or at least a change.

 

[vette427sbc]

Functional, might be a reasonable description. One thing about flares, cut them off and screw on some of those extra wide ones from Duntov!

It was a newly posted video. I kind of liked it. Figured it was more appropriate than some of the big $$ stuff in other vids I have posted ( which I can’t afford ) or at least a change.

I’m always the one telling people function is form... maybe I’m just jealous he’s driving his and I’m busy playing keyboard car designer.
Anyway, I enjoy all of the content... cool to apply the super car stuff to our cars, but interesting to see what other corvettes are actually using. He does drive the hell out of that Rambo c3

 

[BBShark]

Slightly off topic, but am I the only one that thinks the flares are "poorly executed" (putting it nicely) on that car?? The wing is cool, I imagine it has to be at least that tall to give any notable benefit with how dirty the air is on the rear deck of these cars. The diffuser probably cleans up the airflow quite a bit considering the rear is almost a parachute without the spare tire up there.

I'm with you on that. They do look added on but I suppose that is a byproduct of how big they are. However, it looks like a very nice build.

 

[mfain]

Slightly off topic, but am I the only one that thinks the flares are "poorly executed" (putting it nicely) on that car?? The wing is cool, I imagine it has to be at least that tall to give any notable benefit with how dirty the air is on the rear deck of these cars. The diffuser probably cleans up the airflow quite a bit considering the rear is almost a parachute without the spare tire up there.

I'm with you on that. They do look added on but I suppose that is a byproduct of how big they are. However, it looks like a very nice build.

Looks like he followed the lead of Danny Popp and Brian Hobaugh with their C-3/C-2 autocross cars from a few years back - Van Steel, JRI shocks, tubular control arms, hugh spoiler, and fat tires. Both of those guys moved on to a C5 platform in recent years to compete in the Optima Ultimate Street Car Challenge. On the video, at the end, even though it showed a little C-3 throttle oversteer, it looked pretty hooked up when he entered the highway.

 

[rtj]

I think Phantomjock posted this in a different video.

Most extreme actuation after 1:30.

[ame]https://www.youtube.com/watch?v=5mK_wFM4yt8[/ame]

 

[rtj]

New video, not directly aero, but 3D printed pistons for Porsche have internal features that aid cooling.

[ame]https://www.youtube.com/watch?v=RrVRSbc6Oec[/ame]

 

[Kid Vette]

https://www.youtube.com/watch?v=wOidYnBE7vs

Huge spoiler on the rear and the diffuser are interesting.

I believe that is Chris Gonzalez' old Vette.

 

[rtj]

Stacked/tiered diffuser. Just posted. 2009 F1.

[ame]https://www.youtube.com/watch?v=btEcNjIz-4U[/ame]

 

[rtj]

[ame]https://www.youtube.com/watch?v=XBY4J_qKSDo[/ame]

Posted 2 days ago.

 

[rtj]

Just uploaded.

[ame]https://www.youtube.com/watch?v=XpVPPkDx_Ic[/ame]

 

[rtj]

[ame]https://www.youtube.com/watch?v=d_z28UP8cgI[/ame]

 

[rtj]

It is a sales pitch, but some nice pics of details. Just uploaded in the last couple of days.

[ame]https://www.youtube.com/watch?v=jzVXK_vaegw[/ame]

 

[rtj]

[ame]https://www.youtube.com/watch?v=EaWkHI584bE[/ame]

 

[mfain]

I rented a Maserati Levante S for a recent road trip. It's an all wheel drive SUV with a twin turbo V6 (426 hp). There is an upgraded version with 509 hp. It has a sport mode and an off road mode. On the highway at about 75 mph you get a display message that "Aero 1 ride height has been achieved". You can feel the car lower itself and louvers in the front grill close - active aero. Seeing that there was an "Aero 1" mode, I went looking for Aero 2, but never did find it. LOL

Pappy

 

[phantomjock]

Pappy - guess you weren't going fast enough?

from brochure: their spelling - not mine
AERO 2
Automatically activated at even higher speeds, it reduces the vehicle's height by 35 mm compared to the normal mode to minimise aerodynamic resistance.

I'm still working on active wings - active suspension will be a bit of an effort. Progress has slowed while trying to sell a boat!

more from brochure --
The height adjustments also interact with the engine operation modes for the ultimate in overall efficiency. This air suspension is then combined with Maserati’s acclaimed Skyhook system, with shock absorbers featuring continuous damping variation. The basic setting prioritises comfort, whereas for a more dynamic drive, the shock absorbers stiffen and the car assumes a more sporty character

Cheers - Jim

 

[rtj]

Recently uploaded. YouTube algorithm working great.

[ame]https://www.youtube.com/watch?v=5gt9Ykrq50M[/ame]

 

[rtj]

Aero 1 mode That’s like the day you learn your car has competition mode.