Problem 1 - Solved
As said on the previuos post, the flying toys won’t fly or at least they will not fly using the output that the Arduino board would feed them So I switched over to using fans instead. So I went to the electronics stuff show and asked about the biggest computer fan that they would have. They got me some 12 centimeters computer fans, or they are better used for the voltage transformer of computer cases. These fans run at 12 Volts and half ampere so the output from the Arduino board is not enough to feed them.
What we have to do here is to build a little amplifier. I will try with simple npn transistors, and see what happens. I have been told that probably they would burn up and that I would have to buy a more powerfull type. Here is a picture of one of the three fans that I will be using on my project:
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