Reely Piper J-3 Cub 2.0 RtF Notice D'emploi page 54

If the control lever for the rudder and elevator functions is moved up, the elevator must deflect to the bottom. In flight,
the landing gear is pressed upwards and the model dives. This control function is required to put the model into a
normal light position if it wants to ascend too much due to a control error or a gust of wind.
If the elevator reacts opposite to the function described above, you may change the direction of the elevator servo with
the reverse switch (see figure 2, pos. 7). There is a separate switch for each control channel. The elevator direction is
switched with the 2nd switch from the left (CH2).
Rudder function
If the control lever for the rudder and elevator functions (see figure 2, pos. 4) is moved to the left, the rudder must
deflect to the left. In flight, this pushes the tail unit to the right and the model will roll to the left around its longitudinal
axis due to the changed flow situation at the wings. You have to slightly pull on the elevator control so that the model
does not lose any height in this slanted position.
If the control lever for the rudder and elevator functions is moved to the right, the rudder must deflect to the right.
In flight, this pushes the tail unit to the left and the model will roll to the right around its longitudinal axis due to the
changed flow situation at the wings. You have to slightly pull on the elevator control so that the model does not lose
any height in this slanted position.
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Figure 19b
Figure 20a
Figure 20b