Reply to "Wheel calibrations"

AdminMember

It's possible that the direction effect could be that I managed to keep a straighter line in one direction than I did in the other. I hope not. The fact that I didn't see that on the paved course indicates to me that it isn't that hard to keep a straight line.

The two wheels were very different. Mine is a cheap plastic one with a continuous gear drive, and the one I borrowed was a heavy steel one with a clicker every meter. I don't know what causes the difference on grass but I have no doubt after this that it is real. Slipping could be a factor but so could the fact that you are deforming the surface you are measuring on the grass. Pushing down harder to avoid slipping may actually make things worse.

> It shows that at least some people can get a good measurement with a wheel!

I would venture to guess that in the history of the sport of cross country no one has ever calibrated their wheel before measuring their course.

10/26/113:42 AM

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