Got it! merci beaucoup!

Yeah, I thought so (option to tick when one uploads a model). But then what is the profile for? How to view the guy's account profile?

Ok, so mabe there is no way...

high! how do I get to write a message to other 3D warehouse users? Where can I see their profiles?

Thank you very mutch Gaieus. You can have a look.
http://sketchup.google.com/3dwarehouse/details?mid=8f87755f22470873e6725f2a23469bfc&prevstart=0

the sign in window gives me this error message sign-in error. try signingin to your google account from a web browser. I do all right and still get the same message... please! what is the problem?

Thanks Paul!
Middle button it was. I remember I had changed the mouse batery around the time that happened and for a few minutes the cursor was frosen. Now the mouse wheel was set on 'universal scroll' .
This is going to save me alot of time.

High!
When I first opened the program the funtion worked A1 ; After I had set my keyboard shortcuts in the preference menu it would just zoom in and out . Been trying to find the problem with no success.
Is it just me?..

Greetings! I am a passionate amateur trying to concretize my ideas.
I usually hand modle concept cars and test in a stream of water to simulate air (wind) behaviour around the shape.
I had recently descovered SketchUp (2 monts ago) and I'm loving it . My skills are improving with every hour.
One of the ideas I would like to test consists in 'Propeller-shaped Mag Wheels' that would suck air from beneath the car and expell it sideways (outward). The only way that I see is to have the car rolling on a surface at given speeds and in various wind conditions (direction, velocity, viscuosity...)
Hence, my question:
How do I 'viltual wind tunnel'-test my SketchUp7/SketchyPhysics concept car model? What software is there available? What are the steps to follow?
It is all for a good cause... I am trying to develop a 5 seat 4WD all-electric car.
Many thanks in advance!