Would be interesting to contact them! CPA how is your dealing with Zelocity going!
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Frans.. Yes I agree 100 %... In regard so claims it is just as you said.. They claimed that they were measuring spin when in fact they were not... Great paper and I am glad you sent me the link.. I had read bits and pieces that must have been reposted... Glad to not only find the whole paper, but it's even better to have contact with the author!!! You are the spin doctor!! I will read it thoroughly as it should be..
As far as calculations go... Again yes there are calculations to come up with an rpm.. Because I have yet to find a system that super slow motions the whole flight of the ball and counts each one... At some point it must have been done and thank you whoever did it... Many folks that do not have any interest in how all that software works only see things two ways..1- measured and 2- calculated... Even though in reality calculations are part of measuring... Kind of like getting your pulse taken at the doc.. The only check for 10 secs and then multiply by 6 to get your total..
Too bad you don't live nearby you definitely have a ton of knowledge that is not something you can just look up...