Mini Heli can’t hoover, drifts forward or backward

It happens that your mini helicopter can’t hover in one place in the air. Instead the helicopter moves slow or faster forward or backward. In most cases this is caused by an imbalance. The cockpit is too heavy or light and the center of gravity is not in place and the main rotors don’t blow directly downwards. Toy mini helicopters often show this out-of-box.
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