Flow length of a curved round profile

Hello, I have to make a drawing of a profiler (hollow round tube in 17.2 x 2 mm) curved in an arc, I would like to make an annotation on my drawing of the length of flow to be made.  

How to do it? 

Thank you


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Hello

Look at my tutorial, you should get there and with this method you will have the unfolded for the MEP

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Here is a quick example in Solidworks 2016.


longueur_debit_dun_profil_rond_cintre.sldprt
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Thank you very much for the help!!  

It's great!