Internal Body Aerodynamics

[phantomjock]

My suspicion is (and testing would help - or looking for someone's results)- is that the "uplift" on the hood would act as a gurney-like flap and create a low pressure zone there, just ahead of the windshield, where there is a huge high pressure zone. Sorry, but I haven't seen this testing done on this configuration, smoke, streak, or tuft, let alone wind tunnel. If I come across some documentation I'll bring it on. There was some testing similar on the earlier Grand Sports hood louvers, I'll look for that, and see if there is an analogy.

Sorry, that is a long way to say, maybe - but maybe not. I believe those "should" evacuate air from under hood (and some heat). My radiator on the SR "dumps" like that, minus the grills.

Other examples; Ford GT-40 -- original and new, Factory 5 GTM, many variants of the Ferrari, etc. These analogs make me suspect, reverse flow would be very unlikely on the hood.

Cheers - Jim

 

[rtj]

Has anyone done pressure testing on the raised L88 hoods? I am wanting to reduce lift and help vent under hood temp and pressure with this hood. I read the thread and saw the holes cut in hoods before the buldge here

wouldnt this casue a high pressure area and push more air back in the vents?

I opened those up 10 years ago, it helped a bit to keep under hood temps down. Two biggest improvements I made were a pusher fan in front of the rad and a return flow pressure regulator on the fuel lines by the carb. I was having vapor lock issues.

 

[rtj]

Aston Martin has gone all in on big diffusers ( hold our beer ...). I like the rear tires exposed from the back.


[ame]https://www.youtube.com/watch?v=4mh9Rl7Gips[/ame]

Phantomjock, there are the high exhaust outlets you mentioned earlier.

 

[phantomjock]

Those side skirts are well done too. Liking the feed to the rear wheels and then integrating to the tunnels.

Kool.

 

[rtj]

Has anyone done pressure testing on the raised L88 hoods? I am wanting to reduce lift and help vent under hood temp and pressure with this hood. I read the thread and saw the holes cut in hoods before the buldge here
wouldnt this casue a high pressure area and push more air back in the vents?

https://www.corvetteforum.com/forums/c3-tech-performance/3119779-l-88-hood-vent-question.html

Some photos of old racers here.

 

[rtj]

[ame]https://www.youtube.com/watch?v=1r4oQvG1m2c[/ame]

20 side mirror design iterations. Pretty interesting talk by Hennessy.

 

[BBShark]

No mention of cost. I guess if you have to ask, you can't afford it.

 

[phantomjock]

Mirrors are so "Old Skool!" :amazed:

I'm a bit surprised to not see an array of cameras and a threat warning/proximity system that "calls" for you attention. Less drag too, and what the heck, when you loose power the ecu/brain quits and you stop.

Cheers - Jim

 

[BBShark]

"First rule of motor racing what is behind you is not important"

Cannonball Run

 

[rtj]

A nice section showing aero detail after the 5 minute mark.

[ame]https://www.youtube.com/watch?v=wjJKg8-dsI0&app=desktop[/ame]

 

[rtj]

Mirrors are so "Old Skool!" :amazed:

I'm a bit surprised to not see an array of cameras and a threat warning/proximity system that "calls" for you attention. Less drag too, and what the heck, when you loose power the ecu/brain quits and you stop.

Cheers - Jim

Yeah, must have been a styling choice to go “old school” and have mirrors on a hypercar.

 

[rtj]

[ame]https://www.youtube.com/watch?v=WwKJZwtiRT8&t=5s&app=desktop[/ame]

All these mid-engine cars make me interested in the C8.

 

[Kacyc3]

Does anyone have a pic of the sidevents cut out and replaced with just wire mesh?

 

[rtj]

Does anyone have a pic of the sidevents cut out and replaced with just wire mesh?

Photoshop may be your friend. Actually, on the rubber bumper cars a big wire mesh vent might be an improvement. I opened mine up a lot, like 2x maybe.

Better yet, leave the indent of the existing vent and just replace the flat “bottom” with mesh.


Edit

http://www.vettemod.com/forum/showthread.php?t=10458&highlight=Hood+vent&page=2


Do it something like post 11 photos of the hood.

 

[rtj]

[ame]https://www.youtube.com/watch?v=8qvaO9YpL1M&t=71s&app=desktop[/ame]


Sorry if you are sick of hyper cars, but they are leading the fleet on aero.

Has anyone got photos of front canards on a c3?

 

[phantomjock]

The question intrigued me, so I had to scour the HDDs (over 100,000 images!) and the best I could come up with are a few C3s with what might be called "dive-splitters" or a highly modified "shovel nose."
Here are a few:


They leave little opportunity for "adjustment" but some could have canards added to the outside too. Elvira's closely approximates the grey nose in upper right, blends the splitter into the flare, and includes a vertical segment(side), like the two shown shown the left.

Cheers - Jim

 

[rtj]

Thanks for looking, :thumbs: , a tastefully designed canard for a c3 might be a viable product for someone. Probably would be a splitter canard package. Can’t think of a reason it wouldn’t work.

I remember seeing a c3 in a wind tunnel with lots of aero, I’m thinking Greg Picket, with a Greenwood widebody

It was close to this with more aero additions.


http://ftp.registryofcorvetteracecars.com/photos/6_pickett_greenwoodtubeframe_credit_tonymezzacca.jpg[img]

[url]http://ftp.registryofcorvetteracecars.com/photos/6_pickett_greenwoodtubeframe_credit_tonymezzacca.jpg[/url]

 

[rtj]

Suggestions from YouTube....

[ame]https://www.youtube.com/watch?v=sf4as_5wGH8[/ame]

[ame]https://www.youtube.com/watch?v=NRGttv0NS7s[/ame]

 

[rtj]

Active aero on the rear wing. Braking assist maybe?

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

 

[rtj]

Nice write up on CF and it includes some C8 aero discussion.

https://www.corvetteforum.com/artic...e=jan16&utm_medium=email&utm_campaign=content

 

[phantomjock]

And the text that goes with the image:

Do-it-yourself aero modifications can produce excellent results. Paul Costas’ record-setting tube-frame Camaro features a simple front splitter and rear wing, and the radiator air is ducted through the hood. The radiator ducting reduced under-hood pressure so much that it took a huge rear wing-angle increase to balance it.

From a good article over at Speed News:
https://nasaspeed.news/tech/aero/ai...ases-lap-times-and-isnt-that-the-whole-point/

 

[Kacyc3]

whole lot of info that was removed from that site is still available thanks to the wayback machine.

https://web.archive.org/web/20180717025726/https://www.pro-touring.com/threads/101460-Designing-Aerodynamics-for-Track-Performance

 

[phantomjock]

Yeah, it's too bad we've "lost" some great info. The Wayback Machine only covers the first 2 pages. I may have some I've saved for personal review. PM if you'd like. Its not something that should be "posted."

Cheers - Jim

 

[rtj]

[ame]https://www.youtube.com/watch?v=mnnEtEqFr34&app=desktop[/ame]

I like the fender vents.

 

[phantomjock]

Yes, nice. aAd LARGE too. Better still the rear fender "treatment." Using the flying buttress to make a duct for the rear airfoil is something a few have done before. Notably Ferrari has a smaller version and certainly a few hyper-cars too.

Nice "reap."

Cheers - Jim

 

[rtj]

More “flying buttress” aero....


[ame]https://www.youtube.com/watch?v=5uPd-ZXETJw&app=desktop[/ame]

 

[rtj]

[ame]https://www.youtube.com/watch?v=EIi8xrI068A[/ame]

Teaser video.

 

[rtj]

[ame]https://www.youtube.com/watch?v=vFpJ4LndyNE[/ame]


The cutouts in the front fender flares are interesting. Definitely for aero reasons, as the water and dirt will be flying over the sides of the car.

Lots of hood ducts, must be for cooling radiators. Wing mounting also optimized.

Lol, the camera man jumps at 3:00 when they fire the car up.

 

[rtj]

Great idea until you vacuum up “who knows what.” Hyper car wars are heating up.

[ame]https://www.youtube.com/watch?v=G-cO_2BkAag&app=desktop[/ame]

 

[rtj]

Sort of neat. Some cooling details.


[ame]https://www.youtube.com/watch?v=6501XRLQJIQ&app=desktop[/ame]