For aerobatic flying a line length of between 5 to 7 metres must be used in conjunction with a good high power supply unit.
Models, through elevator and rudder adjustment, can be adjusted from docile advanced trainer to full aerobatic performance. After initial trimming has been carried out, increase the elevator. With the model flying at about 2 metres high on the downwind side of the circuit, reduce the power as it starts to come into wind. After the model has dropped about 0.5 metre, put on full power and it will go through a full loop.
Once this stage has been reached, both model and pilot are ready for a full aerobatic performance.
The model must be trimmed to fly smoothly and at an altitude of 2 to 3 metres on no more than 50% power. Flying lines must be very slightly slack. With the model flying in this trim, the rapid application of full power should take it through a smooth loop.
Power must be reduced when the model reaches the inverted position and then gently increased to gain a smooth pull out without stalling. When it reaches the entry point, reduce power again so that it does not go into another loop.
Under no circumstances must power be drastically reduced during the climb as this will inevitably lead to a stall and crash.
A wingover is performed in exactly the same way except that, on the climb, power is reduced very slightly. This enlarges the loop and allows the exit point to be opposite the entry point.
If you have found that with your particular hand controller it is hard to fly lower than 30 cm off the ground reliably (e.g. for a landing or low pass) because the motor does not seem to run slow enough, then try `blipping' the power. That is, pulsing the motor on and off very quickly. In this way the motor power output is reduced and so is the model’s altitude.