[Vanne]

i concur , the trend line would give some usefull info over a longer section of road, however, ive never hear of anyone measuring downforce in this way. Let us know if that works out, Iam writing some code for an Adrino R3 based active aero servo setup, pretty simple to hook one of those up with a high torque servo connected to your wing. I am 1/3 into this as a project myself.