User Manual

● Subtrim behavior: When set to default, adjusting subtrim will only shift the center of the servo throw.
Given a -100% to +100% order from the mixer, the servo will still move exactly between the lower and
upper limits, without clipping or dead band. This introduces a different stick to servo movement relation
for both sides of the stick. Depending on the situation it can be either convenient or problematic, so the
= setting has been added to change subtrim effect to rather shift the servo throw "symmetrically". A full
throw order from the mixer can now be clipped by the limit that is on the same side as the subtrim, while
on the other side the servo will not reach the limit anymore. That way on both sides of the stick a given
stick movement always results in the same servo movement. Typically using the default mode allows for
faster setup of servos that are driven by a single control input, while = is required to keep correct
response of control surfaces using differential and/or mixing several inputs together. The = mode
typically requires reducing D/R so that a margin is left between full "control" throw and the defined limits.
The following diagram illustrates the respective behavior of both subtrim modes and how Center adjustment
compares to them:
The last line after CH32 is the "Trims to Offsets" function. It is used to take the trims of the currently selected
flight mode, transfer their content to the subtrims, reset them, and adjust all other flight modes' trims. If you're
close to running out of trim, instead of having to adjust every value one after the other, all it takes is to LONG
press ENTER on this line and everything is done magically. Beware that you should still check if it would not be
wiser to correct the problem mechanically, especially with large values, as depending on the subtrim behavior
setting it might lead to either insufficient and asymmetric throws, or clipping/dead band.
Curves
Custom curves can be used either in input formatting or mixers. There are 16 of them available, and they can be
of several types (3, 5, 9, 17pt, both with fixed or user-definable x coordinates). 3pt would be a 3-point curve with
fixed x, 9pt' is a 9-point curve with user-defined x coordinates.
These curves are available in addition to the "built-in" curves:
● x>0, x<0: If input is positive resp. negative return input, otherwise 0.
● |x|: Return the absolute value of the input.
● f>0, f<0: If input is positive resp. negative, return 100%, otherwise 0.
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