I couldn't get the apps to work right. Have to do that another day.
...instead I "calibrated" my speedo against my GPS. At 60 it read exactly 50mph. I used the stopwatch app on my cell 3 times. Every single time it was exactly 11 seconds to 60.
Cool! Gonkulator predicted 0-60mph in 10.44 sec, along the way to a 17.76 at 77.0 1/4 mile. Close enough!
