wing comments, rear wing Options

[Glenn832]

This is just a fantastic forum! Being quite the newb, forgive me if I'm on the wrong thread. I need some advise and I know that it'll be freely if not copiously given. I like it already!

We've got a '74 that, at the moment, is in pieces. It's a street/track (little more focus on the track) baby that is getting some minor additions to help with high speed stability. One is the addition of a rear wing. There are two choices. As you can see from the pics, it's not pretty but at this point that's not the point.

What do you think about aerodynamics/functionality and also aesthetics?

[Matt Meyer]

I think your wing has to be high.

But I would get the front planted before I add downforce to the back.

My free advise on vortex generators on a 914.....

When engineers put vortex generators on a surface they are ususally trying to get the airflow to stay attached (in an unfavorable condition).

The rear window of a 914 is less of an unfavorable condition and more of an impossible condition. I am unaware of any way to keep the airflow attached over the back deck of the 914 short of making a "fastback".

The vortex generators that got a buzz here before apparently were designed to cleanly separate the airflow from the surface much like a small spoiler will do. So while there may be some benefit, there is still not "good air" near the rear deck. I do not know if this type of vortex generator or a small spoiler would allow for lower wing, but it won't allow for a fuctional device near the deck.

I am not an aeronautical engineer so you were overcharged for this advice.
Check out this webpage Chris Cassedy's Webpage on 914 aerodynamics.