Reply to "USATF certification of off-road course"

bobthurstonMember

Let me jump in here, I think I advised Lyman to do this with a different course. My reasoning is this: rough-surface cal course seem to consistently produce lower constants (see Mike
Sandford's research in this area). So an off-road course measured using a road cal course is very unlikely to be short. It might be too long for our taste but not grossly too long.

I gave an example of this with calibration numbers before, and I will look up the reference and also the information from Mike Sandford.

By the way this applies to pneumatic tires. For a while in the 80's I was using a non-pneumatic tire and I discovered that it had a reverse effect (i.e. it gave more counts on rougher surfaces).

I agree that it is preferable to lay out a cal course on the same surface you're measuring on the course but I'm just saying I think it's ok to do a road calibration and an off-road measurement.

4/7/138:38 PM

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