I somehow had to use the engine with revolutions of 5500 rpm.
But the information engines themselves did not have what to do?
A friend suggested a very simple program on a PC.
Using this program, you can determine the number of engine revolutions by changing (in reasonable limits) the current supply voltage.
to download the program.
The program is checked by antivirus, you can not worry.
The program is in Russian, everything will be clear.
Download the program and install it on a PC.
Now we select on the motor shaft (propeller), there is no propeller, you can use a piece of electrical tape.
Having assembled it in half, we wind the electrical tape on the engine pulley, something like this.
Connect the microphone (I have a laptop, the microphone is already connected).
Run the program.
We connect the power to the engine. When you turn on the power, the engine starts to work.
In the program, press the REC button.
We bring the engine to the microphone, and lightly touch the fan or glued electrical tape. It turns out a slight crackle.
At this time, we bring the engine to the microphone and the program starts recording.
Press STOP.
We have a diagram.
Where the diagram has a clear “comb”, click, hold Ctrl and spin the mouse wheel to zoom in on the diagram.
Select one period, focusing on some element. I chose the bottom peak.
Check "Duration"
Analysis. Duration is the time (in seconds) during which the engine has made one revolution. To find the rotational speed in revolutions per minute, you need 60 divided by the duration, in other words:
t-time in miles seconds.
n-speed.
This is an example.
