Trim Step - JR PCM9X II User Manual

Trim Step

The Trim Step function provides for adjusting the
sensitivity of the trim levers. It is useful during and after
initial trimming of the aircraft, in order to trim the aircraft
quickly at first and then to make very precise
adjustments to aircraft trim. When adjusting the digital
trims (SPOI, AILE, ELEV, RUDD), the total trim travel
does not change—only the number of increments
(beeps) changes, which makes for finer or coarser trim
movements. The digital trims may have a setting of 0–
10 with 10 being the coarsest adjustment. When the
value is set to 10, there are only 10 trim increments
from center to each end. When set to 5, there are 20
trim increments from center to each end. When set to 4
there are 25 increments. When set to 3 there are 34
increments and when set to 1 there are 100 trim
increments. When set to 0 the trim levers cease to
function and can no longer be used to change the trim
of the aircraft.
When adjusting the analog spoiler trim, however, the
total trim travel is actually reduced when set to less
than 100%.
Use a fairly coarse setting such as 4–6 when test flying
an aircraft in order to be able to trim the aircraft quickly,
and then use a finer setting such as 3–1 for final
precision trimming.
1. Highlight and select TRIM STEP in the Device SEL
display of the SYSTEM Menu to acquire the TRIM
STEP display.
2. Highlight and select the trim that is to be changed
and use the Selector to set a value of 1–10
(1 = finest, 10 = coarsest).
3. Repeat for other trims as desired.
4. Select the type of trim required. On a normal trim,
adjustment of the trim will affect the end points. On
L.S.T (Limit Stroke Trim), the end points will NOT be
affected by the trim, this prevents the trim from
overdriving the servos.
11 Sailplane Section