There are plenty and quite many scientific articles available for free on Internet. Universities at least have some check, quite often a written Exam before course could be passed, a little hard to check what kind of books/articles someone have read and even more so what they might have learned.
There is a difference between knowing something and passing exams. Who would you trust more? Someone who is self taught and has recent experience or someone who passed the exam 10 years ago and has never touched the subject since?
If you need proof of someone's competence then test results are indeed a reasonable indicator, as long as those results are relatively recent. In that case there is nothing stopping the self taught person from taking the tests. Anyone who passes the test has the required knowledge to pass the test, no matter how they learned it. Of course you are relying on the test asking the right questions.
Met this attitude then working, "it will all be fine if we just get the project".
No, that's just putting your head in the sand and hoping for the best.
Quite often try even though I do not think I can do it or good enough.
The point is that you try, and in many cases probably succeed. Too many people don't try.
It must help to know something about the connection between the stick and the rudders.
For the passengers? Not really. It's a big metal tube that flies. That's all they need to know.
For motion control using an electric motor it is really good to know the equation of a DC motor. It's not that complex get thing moving but to make it perfect is and require knowledge in mechanics, electronics, mathematics and to some degree software.
True if you are building the machine. If you are the operator you don't even have to know what a servo is, let alone the theory of how it works. The required level of knowledge depends on what you want to do. As with any subject, the harder you look the more there is to know.
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