H-12
The Trim System function adjusts the sensitivity of the 12X
trims, hovering throttle and hovering pitch trimmers and the
high pitch lever. The digital trims are adjustable from 0–10
with 10 being the coarsest adjustment and 0 being trim off.
Adjusting the digital trim values has no effect on the total trim
travel (unless 0 is selected), however, it affects the resolution
of each trim input. When the value is set to 10, each click of
trim adjusts the servo output by 10µs and there are only 10
trim increments from center to each end. When set to 5, the
output is changed 5µs per trim step and there are 20 trim
increments from center to each end. When set to 1, each click
of trim changes the servo output by 1µs and there are 100 trim
increments. When set to 0 the trim levers cease to function
effectively, turning off the trim function. The Hovering Throttle
and Hovering Pitch trimmers are adjustable from 0 to 200
and can be turned on/off. When adjusted to above 100%, the
trimmer functions as a three-position switch. Reducing the
value increases the number of output positions. The trimmers
83: Trim System
can also be set to function as a Momentary switch by selecting
ON under Moment for either or both trimmers. When adjusting
the digital trims (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.
When adjusting the analog throttle trim and the high pitch
trim, however, the total trim travel is actually reduced when set
to less than 100%. It is recommended to use a fairly coarse
setting, such as the factory default 4, when test flying a model
for the first flights in order to be able to trim it quickly, and then
use a finer setting, such as 3–1, for final precision trimming.
L.S.T. Trim
The L.S.T. trim feature has two options, L.S.T. and normal. In
normal, when making trim changes using the Aileron elevator
or rudder digital trims, the center as well as the endpoints are
affected by the trim values ( i.e. right trim causes the center,
the right endpoint and the left endpoint to all shift to the right).
When L.S.T. is activated, only the center position is trimmed
(i.e. the center is shifted to the right but the endpoints are not
affected). This is useful for helicopters that have a hard stop
endpoint to prevent over-travel caused by trim or if it’s desired
to have trim changes not affect the total roll pitch or yaw rate.
L.S.T. trim is normally turned on for helicopters.
Summary of Contents for JR 12X
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