[dcb]

build a model and roll it down a ramp and measure stuff. Add a couple little diy electric eye timers to make it more like a science.

Note, it needs to be going pretty fast for accurate scaling, moreso the smaller the model, so maybe a launcher and a net at the ends of a bit of track. (air launcher? spud gun?) and note several times and distances (should be decelerating) and figure out the cda curve. Then weigh it and figure out A (and crr with similiar but slower tests)