Futaba 10J - Manual (Page 127)

If this trim offset function is used, independent
trim adjustments can be made during hovering and
in the air. This function can offset the ailerons,
elevators, and rudder neutral position by linking
to the set switch or condition. A habit that tends
to appear from the standpoint of helicopter
characteristics when flying at high speed is
possible. This function can correct this habit.
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