C3 Rear Spoiler
11-06-2012, 05:14 PM
#42
Great pic of the spoiler on Red69's '79 
Last edited by worship79; 11-06-2012 at 05:16 PM.
11-06-2012, 05:41 PM
#43
Le Mans Master
11-06-2012, 05:57 PM
#44
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My friends 76. No decent newer pics as it's been in storage for years, but these mods were done over 30 years ago.
On an unrelated note but same car, hows that for a C3 hood....... I'm not the biggest fan, each to their own.
On an unrelated note but same car, hows that for a C3 hood....... I'm not the biggest fan, each to their own.
11-06-2012, 08:20 PM
#45
Team Owner
69 racing vette
11-06-2012, 10:45 PM
#48
Burning Brakes
How effective are spoilers like that?
I have been thinking about putting some kind of wicker on the rear like this:
Might help draw some air up from my rear diffuser if I ever finish that
I have been thinking about putting some kind of wicker on the rear like this:
Might help draw some air up from my rear diffuser if I ever finish that
11-06-2012, 11:23 PM
#49
Le Mans Master
FWIW, aero kit offered/recommended for racing in Chevy Power books from that era would seem to indicate there's a bit of turbulence over the rear deck of pre-fastback C3's which apparently requires a fairly substantial spoiler. So, I wouldn't expect much out of a wicker on one.
Last edited by TheSkunkWorks; 11-06-2012 at 11:26 PM.
11-07-2012, 02:25 PM
#51
Race Director
I am a firm believer in the integrated spoiler on the back and air dam on the front of my '80. At 120mph+ it is very stable and glued to the track.
11-07-2012, 02:26 PM
#52
11-07-2012, 02:27 PM
#53
Drifting
I Agree!
The stk spoiler molded onto the body just looks right!
I would like to see one "Double Wide" with some yarn testing.lol
The problem to me is getting the spoiler high enough to catch air,
then cutting it back down to see the lower limit of effect? I think?
I'm guessing that 3-4 inches of spoiler in contact w/airstream,
would be effective. That could end up a "Triple Wide" to get
any real effect at less than racetrack speeds.
BTW: I remember an Aero Engineer saying something to the effect
that 25% of cda comes from under the vehicle.
R
I would like to see one "Double Wide" with some yarn testing.lol
The problem to me is getting the spoiler high enough to catch air,
then cutting it back down to see the lower limit of effect? I think?
I'm guessing that 3-4 inches of spoiler in contact w/airstream,
would be effective. That could end up a "Triple Wide" to get
any real effect at less than racetrack speeds.
BTW: I remember an Aero Engineer saying something to the effect
that 25% of cda comes from under the vehicle.
R
11-07-2012, 03:41 PM
#55
Le Mans Master
I highly suggest functional front dams or rear spoilers should always be installed with an equally functional counterpart at the opposite end to avoid possible aero imbalance at high speed.
11-07-2012, 03:49 PM
#56
Drifting
The local Hobby Stock cars usually have some kind of "Cowcatcher" in front and something about the same size and close to the same angle in back.
That makes sense to balance the aeros. The front gets a much better exposure to the clean air than a rear spoiler would.
JMHO
R
That makes sense to balance the aeros. The front gets a much better exposure to the clean air than a rear spoiler would.
JMHO
R
11-07-2012, 04:19 PM
#57
Le Mans Master
Of the issues I've experienced on track over the years, loss of aero balance has been among the most diabolical, short of suspension failure. Best not to underestimate this stuff IMCO.
11-07-2012, 04:51 PM
#58
Race Director
The "ground effects" race cars of the 70's-early 80's that were used especially in the non-open wheeled type cars such as CanAm stuck to the track like glue only problem was cornering. One CanAm car held the track record for years.
The suspension had to be rock hard with no body roll if one side of the car came up air got under it and most of the down-force was all but eliminated making the car fly off the track. They banned it after only a few years
The suspension had to be rock hard with no body roll if one side of the car came up air got under it and most of the down-force was all but eliminated making the car fly off the track. They banned it after only a few years
11-07-2012, 07:41 PM
#59
Race Director
