Cd and blunt front ends

[Cd]

Adding some more to this dead thread. Sorry for "beating a dead horse".

Here is an image of the car shown above as it was tested in the wind tunnel.
Of note would be how that the barn door flat front end of the car has even less of a radii than the white Camaro, no 'moonies' for the deeply inset wheels, and ( rear ) tires which stick out directly into the airflow. As shown in this image, the Cd was .292




Reading over this thread, I have to apologize for misspelling " Cd " as .Cd - as was pointed out to me, there is not period before "Cd".

I'm learning.

I also found this image interesting. The windshield is near vertical, yet there is attached flow along the roof. I guess this is a good example of how little curvature is needed to retain the airflow.

[Frank Lee]

Nice illustration of the stagnant bubble at the base of the windshield, where everybody is always freaking out over "draggy wipers".

However on new stuff with hoods and windshields almost at the same angle the story is probably different at the "cowl".

[Cd]

Speaking of pressure bubbles and such -

I can't tell from this photo, but it appears as if the airflow has a bubble further up the windshield.( But then it could be that I am just not seeing the blacked out cowl in front of the windshield . ) At first, I thought I was seeing some strange phenomenon that occurs with rounded windshields. My guess is that I am just not seeing the cowl very well.

[Hermie]

Daaaamn. Did anyone notice the front-end lift numbers of the stock Camaro in thr first post? That's definitely enough to make it hard to swerve out of the way of a car cutting you off on the highway, even when you done it down to freeway speeds.

[winkosmosis]

Hermie, I think you look at everything that isn't a spoiler and see dangerous lift.

Edit: Oh wait you said the numbers.

[Cd]

Originally Posted by Hermie

Daaaamn. Did anyone notice the front-end lift numbers of the stock Camaro in thr first post? That's definitely enough to make it hard to swerve out of the way of a car cutting you off on the highway, even when you done it down to freeway speeds.

( Those front end lift figures are at 250 miles per hour. ) As slow as we drive, front end lift and negative handling is the last of my concerns.
I would be more concerened with the lady on the cell phone in the next lane.

[Frank Lee]

Hermie must have been permanently traumatized by a strong wind as an infant.

[MadisonMPG]

Originally Posted by Frank Lee

Hermie must have been permanently traumatized by a strong wind as an infant.

I think it was strong lift due to a bad design of his mothers uterus.

[MadisonMPG]

Originally Posted by Hermie

Daaaamn. Did anyone notice the front-end lift numbers of the stock Camaro in thr first post? That's definitely enough to make it hard to swerve out of the way of a car cutting you off on the highway, even when you done it down to freeway speeds.

More math for you, but I don't think it's going to help.
250mph/4 = 62.5mph (highway speed for most of us)

Lift quadruples as speed doubles. So if you half the speed, lift will fall by 4.

aka @ 125mph the lift is now 100 pounds
and @ 62.5mph the lift is now 25 pounds

I believe my math is somewhat correct.

[aerohead]

Originally Posted by Cd

Speaking of pressure bubbles and such -

I can't tell from this photo, but it appears as if the airflow has a bubble further up the windshield.( But then it could be that I am just not seeing the blacked out cowl in front of the windshield . ) At first, I thought I was seeing some strange phenomenon that occurs with rounded windshields. My guess is that I am just not seeing the cowl very well.

I can't make it out.The first line of tufts on the windshield appear to be defying the flow just above and below.I'll look for a "daytime" shot of that M-B.Perhaps it will reveal cowl info that explains the phenomena.Good eye!