Rear spoilers

[SuperBuickGuy]

Has anyone done the research regarding effective rear spoilers for C3s? My working hypothesis is the spoiler would have to be above the roofline to truly be effective (don't care about whether or not it's a ricer look, but it must function)

While the gas tank is out, I want to brace the deck for a spoiler.... thus the timing of the question

 

[mrvette]

SO I WAS TOLD, the only truly effective spoiler of any generation was the early 70's Super Bird......and that wing was really tied hard to the car, not some POS tack on crap.....

other than that, I dunno....


:toothbrush:

 

[MYBAD79]

simply function? yes, ricer style high mount would probably be best but you'll have to eliminate the huge parachute under the car to really gain some downforce at speed..... not trying to sound like a "know it all" but there's not much downforce on the front either so you'll need to balance front/rear .... just adding a huge functional spoiler on the rear might increase lift at speed and make things a lot worse ...

 

[SuperBuickGuy]

You mean I should drop the tank down to approximately level with the bumper? what an excellent idea! I should get on doing that :thankyou:

 

[phantomjock]

Drop the tank lowers CG too.
Build a diffuser with a max of 15-20 degrees up from reference (horizontal). A couple of strakes to add a bit of strength to the piece. Then maybe open the rear "bumper." These ought to big improvement to the "parachute." That's what I'm planning/hoping anyway.

Cheers - Jim
BTW that side view with your tank in trial fit (other thread) - looks like it is a great start on your diffuser!

 

[68L71]

Stick to your bicycle....

 

[SuperBuickGuy]

Drop the tank lowers CG too.
Build a diffuser with a max of 15-20 degrees up from reference (horizontal). A couple of strakes to add a bit of strength to the piece. Then maybe open the rear "bumper." These ought to big improvement to the "parachute." That's what I'm planning/hoping anyway.

Cheers - Jim
BTW that side view with your tank in trial fit (other thread) - looks like it is a great start on your diffuser!

I'm hoping to sneak out to get aluminum today.

 

[Ricisan]

PC Aero Package

I remember a while back someone posted some wind tunnel testing results.
As I recall only the 78 PC spoilers made a positive downforce, 15% less cda
I keep thinking that a big cowcatcher "Or splitter" on the front,
and something similar sticking up/out in the back will work.

I would like to at least double the PC rear spoiler and ad lay it back a little and see what that does.
There was someone working on this a while back, nothing recient.

R

 

[mrvette]

I carry no spare tire, and so am kind of curious as to how much MPG I could pick up for drilling those holes in the rear deck, just below the 'spoiler' like some early shark racers did......would it make any significant difference below say 80 mph???

what IS that loading on that parachute effect???

:idea:

 

[GT6Steve]

I read years ago that the Superbird spoiler was not for aero but to draw the eye away from the rear deck spoiler they'd crafted in. From the looks of the high spoiler I tend to believe the story...:1st:

 

[rtj]

There is a guy in Europe with C6R style wing and splitter on a c3. Looks good in my opinion.

 

[rtj]

I like his effort, but it is not for the faint of heart.











Haven't seen new photos of this car for probably 5 years.

 

[SuperBuickGuy]

that is interesting.... I've heard the convertibles with a hardtop are more aerodynamic.... they sure are popular in the race crowds

I also really like his splitter.

 

[rtj]

that is interesting.... I've heard the convertibles with a hardtop are more aerodynamic.... they sure are popular in the race crowds

I also really like his splitter.

Two other good sources for c3 aero are Greenwood's website and the book Corvette Racing Legends.

Greenwoods site has lots of photos. Corvette Racing Legends is mostly C3's.

Greenwood ran a real unique spoiler on some of his widebodies. Think of a 80 style rear spoiler with the center cut out and a variable angle wing installed.

If I get my car upgraded with the 12 bolt, heads, and cam, I may consider a splitter and big wing. But, it probably won't be too refined.

 

[DJ Dep]

Has anyone done the research regarding effective rear spoilers for C3s? My working hypothesis is the spoiler would have to be above the roofline to truly be effective (don't care about whether or not it's a ricer look, but it must function)

While the gas tank is out, I want to brace the deck for a spoiler.... thus the timing of the question

I suspect you would like this too?

Just don't forget the coffee can exhaust tip and neon lighted undercarriage. You wanna have the COMPLETE look when you do this.

 

[rtj]

Greenwood widebody:

 

[DJ Dep]

I like his effort, but it is not for the faint of heart.



Haven't seen new photos of this car for probably 5 years.

It's somewhere in Japan doing drift movies. :rofl:

 

[rtj]

Originally Posted by rtj
I like his effort, but it is not for the faint of heart.

This image has been resized. Click this bar to view the full image. The original image is sized 800x533 and has a filesize of 122KB.


Haven't seen new photos of this car for probably 5 years.

It's somewhere in Japan doing drift movies.

Thanks Dep. Do you have a car yet?

 

[DJ Dep]

Originally Posted by rtj
I like his effort, but it is not for the faint of heart.

This image has been resized. Click this bar to view the full image. The original image is sized 800x533 and has a filesize of 122KB.


Haven't seen new photos of this car for probably 5 years.

It's somewhere in Japan doing drift movies.

Thanks Dep. Do you have a car yet?

Clcik on my public profile. What I have looks 10 times better than these flying wings.

 

[MYBAD79]

You mean I should drop the tank down to approximately level with the bumper? what an excellent idea! I should get on doing that :thankyou:

I know you were talking about lowering the tank in another thread. That's a step in the right direction but it won't solve the parachute issue, there's a lot of open area that air can get into, this might be one reason the rear bumper is attached with so many bolts LOL
Once you lowered the tank maybe add fiberglass or aluminum plates to block air ??

 

[SuperBuickGuy]

You mean I should drop the tank down to approximately level with the bumper? what an excellent idea! I should get on doing that :thankyou:

I know you were talking about lowering the tank in another thread. That's a step in the right direction but it won't solve the parachute issue, there's a lot of open area that air can get into, this might be one reason the rear bumper is attached with so many bolts LOL
Once you lowered the tank maybe add fiberglass or aluminum plates to block air ??

most of the time, when I talk about something; it's because I'm either already doing it or will do in short order - which for some reason irritates the crap out of the trolls - so it's a double bonus





18 ga, Stainless steel #4 finish Pretty huh? :waxer:


anyway, between there isn't much room between the tank and the bumper because there's the back bumper/brace that fills most of the space.....

 

[rtj]

Corvette Racing Legends has a lot of Greenwood info. Unfortunately I left mine in a coffee shop and have to order another copy. If you like reading corvette books, it is a must have.

On another note, It looks like APR performance sells the big CF wing like on the grey C3 for $1500. GTC series, and it looks good on C5 and c6 vettes.

 

[redvetracr]

It`s doubtful in my mind that that silver thing goes fast enough to need all those ricer bolt on`s, Greenwood running Daytona with his wide body is a different story. an old pal of mine used to use the term "it looks like ass" when he saw something he didn`t like, I think it applies to that silver thing.

 

[DJ Dep]

It`s doubtful in my mind that that silver thing goes fast enough to need all those ricer bolt on`s, Greenwood running Daytona with his wide body is a different story. an old pal of mine used to use the term "it looks like ass" when he saw something he didn`t like, I think it applies to that silver thing.

Thank you Howard!! :smash::rofl::thankyou::thumbs::clap:

 

[pancake]

I'm the last guy in the world qualified to offer an opinion here, but see if that stops me. I would think that the Greenwood style spoiler that ties into the rear bodywork would be a lot more effective than a super high wing. And I base my assumption on absolutely no facts at all!

But I did find this neat little article with pictures of all generations of vettes in a wind tunnel..
http://www.corvettefever.com/techarticles/corp_0905_corvette_wind_tunnel_testing/viewall.html

 

[69427]

I'm the last guy in the world qualified to offer an opinion here, but see if that stops me. I would think that the Greenwood style spoiler that ties into the rear bodywork would be a lot more effective than a super high wing. And I base my assumption on absolutely no facts at all!But I did find this neat little article with pictures of all generations of vettes in a wind tunnel..
http://www.corvettefever.com/techarticles/corp_0905_corvette_wind_tunnel_testing/viewall.html

I disagree with the first bolded sentence. Anybody who has a choice to run a wing vs a spoiler (F1, Indycar, LeMans prototypes, WoO, etc) all run a wing. A wing in high clean air is more efficient than a spoiler on a rear deck immersed in dirty turbulent air.

I agree with the second bolded sentence.

 

[redvetracr]

[/quote]

I disagree with the first bolded sentence. Anybody who has a choice to run a wing vs a spoiler (F1, Indycar, LeMans prototypes, WoO, etc) all run a wing. A wing in high clean air is more efficient than a spoiler on a rear deck immersed in dirty turbulent air.
[/QUOTE]


what do they run in NASCAR?

 

[69427]

I disagree with the first bolded sentence. Anybody who has a choice to run a wing vs a spoiler (F1, Indycar, LeMans prototypes, WoO, etc) all run a wing. A wing in high clean air is more efficient than a spoiler on a rear deck immersed in dirty turbulent air.
[/QUOTE]


what do they run in NASCAR?[/QUOTE]

They run what the rules mandate. Innovation or revolutionary changes are restricted in these cookie cutter looking cars.

 

[69427]

It`s doubtful in my mind that that silver thing goes fast enough to need all those ricer bolt on`s, ..............

I disagree. There is no speed threshold where aero suddenly "kicks in".

While any benefits are obviously greater at higher speeds, they are not null at lower speeds.

 

[Ricisan]

Aero's and Bicycling!

Watching the TDF riders cruise at 25mph in a tight formation is impressive.
From that position, drafting is effective from as little as 10mph and I can
really feel it at 15mph.

I remember a record holding boat racer telling me the scoop only works after
60mph.

I'm guessing a small spoiler vs. full body drag takes much more speed to see a difference?



R