First start running the transmitter then the model. The elevator control trim lever (fig. 2, pos. 9) must be in the middle position.
If the rudder flap (1) leans slightly to the left or right, you can adjust it by turning the clevis (2) to set the required length of rudder travel and thus exactly adjust
the side rudder flap.
If you push the left-hand control stick on the transmitter unit to the left (fig. 2, pos. 10), the side rudder flap (1) must extend some 2.5cm to the left.