On Wednesday 18 June 2003 18:19, Bob Axtell scribbled:
> But the problem turned out to be errors caused by tire wear; the same
> number of turns no longer meant the same distance. Worse, it happened i=
n
> the middle of the race! So it was not adopted, although it could be
> recalibrated by an IR burst every km or so, at little expense.

Estimating and adjusting for tire wear should not be a problem, and I'm s=
ure=20
it can be done quite accurately.  It's the calculations for diameter-incr=
ease=20
of tires due to centrifugal force that really add to the fun.  Again, it =
can=20
be calculated for, *if* this parameter is known/measured.  Ugh!

An accelerometer does shine in this case, but a speed (or at least=20
moving/standstill) sensor would still be needed to keep it in check, prob=
ably=20
during standstill.  But at this point, I'd think GPS starts looking like =
a=20
more attractive solution.

Cheers,
-Neil.

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