Need help in understanding the rekation between no load rpm and voltage


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I am trying to make a quadcopter as a project for my university. So I came across a course on youtube about simulation of drones in Simulink.  After i saw the video about selection of motors based on no load rpm and voltage graph.

But I couldn't understand how he got the relation between voltage  percentage drop linear and no load rpm.

If anyone can help me understand the the relation between them it would be very helpful. I have the excel link in starting.

Thank you very much

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