This didn't quite fit in the experiments section... not really related to FE. And it's not exactly an aerodynamic modification :P But for the interested, we were given permission to fire up the water tunnel at my university last year for flow visualization. Here's some of the things we put in there.
Slight upward angle caused the flow to spiral around.
Interesting Pressure Wave Form
Now that is awesome flow attachment :P
I also have some short video clips taken by my camera... I'm waiting for Google to finish processing them. So I guess tomorrow I'll link them
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trebuchet03 
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