|
I measure elapsed time by shooting movies of the speedo with my camera. It records at 30 fps and I find the frame that looks right on target, though the variation could be as much as 5 frames, or .17 seconds. I don't know if that's better than what you figure for GPS, I don't have one.
Thanks for sharing your lessons on the rate of change in velocity. I'm a bit overwhelmed with trying to figure out Cd. I should be able to do the computations fine once I get into the formula, but picking good atmosphere and Crr figures is really tricky, and finding perfectly flat pavement and no wind for testing is near impossible.
Since you've been doing this for a little while, with a lot of attention to detail it would seem, does my procedure seem adequate to you, or would you have some suggestions for me?
|