Re: max speed 369 kph

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I got a similar problem by passing through an alarm gate in a shop. But my
bike computer only reaches 99 km/h. I have to train me more to reach you 369
km/h...





"John Henderson" <jhenRemoveThis@talk21.com> wrote in message
news:c3qrfc$2bcfvi$1@ID-83062.news.uni-berlin.de...
> I came home from my morning ride and found that my bike computer
> (a VDO C10 - wired, not wireless) had registered a max speed of
> exactly 369.00 kph (the C10 reads to 2 decimal places).
> Normally, I see a figure in the 40's or 50's.
>
> I got to wondering about the cause, and thought that I might have
> ridden close to a strong AC magnetic field at mains frequency.
> Since the Australian mains frequency is 50 Hertz, this could have
> switched the fork-mounted pickup at either 50 or 100 times per
> second (depending on whether both half-cycles did the switching,
> or only one - an AC electromagnet reverses polarity with each
> half-cycle). Given that the computer is configured for a wheel
> circumference of 2050 mm, that gives me a switching frequency of
> 50 Hertz exactly (to 3 decimal places) for 369 kph.
>
> So I think I've found the cause, and it got switched only on
> alternate mains half-cycles. Alas it wasn't a sudden, dramatic
> increase in my fitness. Still, it's nice to know the C10 is
> capable of registering pulses at that speed.
>
> John
>
>