Genghis,
Sorry it takes me so long to get back. I haven't found the data you asked about, but I'll continue to look. The last time the FAA asked me to justifiy it I did not have a calibrated trailing bomb and I used a ground course over a surveyed runway and the data was within .5 knots. It was good enough for them at the time. Of course dealing with the FAA is very personality dependent and next time I may have problems.
Dave