Originally Posted by
DaveLeeNC
I've done some work (using my own SS) with power input to explore drag variables. The problem is finding a windless time. It doesn't take much wind to (from what I can tell) really nuke the data. Around here early morning and late evening are best, but late afternoon/evening is not convenient for me and somehow by the time I have had my coffee, the dog is walked, etc the sun has been up a couple hours and the breezes start. Put another way this is a solvable problem and I am too lazy to solve it.
dave
Yeah, you definitely get better results with zero wind -- but the difference across positions is generally so large that as long as the winds aren't too variable you can usually spot differentials. And, if you're using something like the method that Aerolab uses you can generally tell when the winds are too variable to spot a reliable difference.