Reely SKY R222 Notice D'emploi page 68

If the helicopter wants to drift forwards (see figure 21), reduce the speed and push the trim button for the roll function
(see figure 1, item 3) gradually to the back.
If you dismantled the nod/pitch lever function at your transmitter, then you must adjust the opposite trim button (see
figure 1, item 14).
Every activation of a button is confirmed by a short audio signal. The percentage shown in the right half of
the display also changes, and the bar display for the nod trimming slowly moves up or down. When
resetting, the centre trimming position (50%) is indicated with a deeper humming sound.
Push the pitch lever carefully forward and check if the adjustment was sufficient. Repeat the procedure until the model
does not show any tendency to drift forward.
If the helicopter wants to drift backward, carry out a trim adjustment forward.
Leave the trim setting for the pitch function in the bottommost position. This is required for commissioning
the model helicopter. Also see section "Connecting the Flight Battery".
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Figure 21