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Old 05-16-2014, 10:25 AM   #2
JetPlaneFlyer
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Sub trim is similar to what the normal trims do on the Tx. They adjust the position of the servo neutral point which is good, for instance, if you want adjust the arm to be perfectly at 90 degrees,or if trying to adjust a control suface that has no mechanical adjustment on the pushrod.

Generally you should try to keep the amount of sub trim as low as you can, using too much can mean that the servo over-travels and might mechanically bind.
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