Reely 2142121, Руководство по эксплуатации

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b) Checking the drive
Before operating the quadrocopter, test the drive. Only when all four propellers run smoothly and in a perfect circle
can the model be flown with the minimum energy consumption. For this reason, you should quickly check the function
of the drive propellers before each flight.
To do this, rotate each individual propeller carefully with your finger and check the concentricity and the ease of
movement.
When doing this, pay attention to the directions of rotation
of the various propellers.
When viewed from above, the two top propellers (A) turn
clockwise, and the two bottom propellers (B) rotate coun-
ter-clockwise.
Figure 5