Questions tagged [close-reasons]

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Why was this regulations question without a jurisdiction reopened?

This is about Can I fly a friend for money when holding a commercial pilot certificate? We have many questions on the topic, but OP did not say which country. A comment was left asking 'for which ...
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Why was this question on control systems for quadcopters closed?

I do not understand why the following question was closed. Please note that I am not its author. If the Quadcopter is a MIMO Nonlinear System, How Can it be Controlled using PID? Allegedly, this ...