You wouldn't want to measure absolute speed, you'd want to measure 
acceleration. Otherwise you'll get wildly different results unless you 
could test it at the same point in the slide each time. i.e. after 
exactly 1 foot. Looking for acceleration would make this easier, just 
measure twice and get the ratio of the two.





Johan Baarman wrote:
> Hi.
> A friend asked me if I could make him a test equipment which could test 
> which of his skis has the best glide. This should be done by timing how 
> fast the skier glides down a little hill. As he is competing in big 
> contests he would like to have a light yet robust design which he could 
> test the skis just before the contest. I think the best way to go would 
> be to use IR and a reflector. One could then use a PIC to measure the 
> time between point A and B. What do you think?
>
> Johan
>   

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