105
Practical example:
If a glider model has spoiler flaps in the wings, they are usually
controlled via the throttle/pitch stick (see schematic illustration in
sketch A and B).
With the stick in front (top figure, sketch A), the spoiler flaps are
retracted.
If the control stick is pulled back to the body, the spoiler flaps extend.
In most models, an elevator deflection must be mixed in for the
model to fly on straight.
Without offset setting (sketch A), the elevator would be deflected
down and up according to the values set with the flaps retracted
and extended.
With half-extended spoiler flaps, the elevator is in the centre position
since the throttle/pitch stick is also in the centre position (see middle
drawing, sketch A).
Use the offset setting (sketch B) to move the throttle/pitch stick all
the way to the front and to change the offset value so that the
elevator is in the centre position again (see top drawing in sketch
B). If the throttle/pitch ever is now moved back to the centre position,
the required elevator deflection is mixed in.
Since the max. elevator addition is already reached at the centre position of the throttle/pitch stick, the
elevator deflection will no longer change if the throttle/pitch stick is taken back farther.
For better illustration, the mixed-in elevator deflection in the drawings in figure 40 was illustrated much
larger than it actually has to be.
Figure 40
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