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Calculation of speed of the shaft on some distance

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.
One another interesting graph already presented in time of measurement, years ago..
Here I did not put any excel formula for calculation. Formula and the measurement points are displayed on the image for two shafts, 7 mm and 8 mm, both using similar mono line. It is interesting that both shafts have almost the same weight, 300 g and 304 g. In time of measurement I thought that 7 mm shaft had 345 g but it was actually 300 g! From the graph it can be seen that if both shafts were same weight than the thinner would have longer shooting range. Well, nothing new, that is already known...
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