There is another method I've used which is great for photography but only good for stuff that doesn't mind getting wet, like bodyshells. If you've got a white bath, rig up a cheap adjustable strobe light, and move the bodyshell slowly along the bottom of the bath in just enough water to cover it. (glue a small stick to the roof) Adjust the strobe light until you see a nice flow stream over the bodyshell. You will see where the vortex's are forming but obviously you won't be able to measure the downforce. A nice angle without any turbulence will be between 12 and 20 degrees.
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