Thank you Bmatthews for the profili2 and xfoil but I am not going to pay for them unfortunately- I am sure no matter how good the programs are real life situations always exceed computer dynamics- because that software works on an algorythm which in many cases is not so perfect in real life. So I used my creativity and took a flat piece of plastic and glues a small cardboard and tape ridhge on the bottom. What happened was close to diagram 1 although it was diagram 2 all the same. The ridge acted as a flap, thus making all the airflow turbulent behind the ridge. I noticed that the boundary layer never detached from the wing- and that is good since that is the crucial part for producing lift. All the flow above the flap was slightly deflected upwards but all the same it was still attached to the bouydary layer.

The conclusion being diagram 2 is underdone and diagram 1 is overdone. What I got was much closer to diagram 2. My conclusion is that the ridge will not severely act on lift production, although it will induce airflow transition from laminar to turbulent a centimeter or two earlier that the natural transition. The wing will produce slightly less lift than the other one (by about 20-30 grams because lift production relies 80 percent on the upper part of the wing which is perfect) but that will not severely affect the flight considering plane weight being about 2.2 kg. Some trimming will do the job.

How did I do my test? I used a tap and some cold water. You all know hydrodynamics are the same as aerodynamics.[X(]

Do you think my conclusion is right?

Yishht87.