I have a Aeroscout S 2 1.1m with the DSX. I'm reading pg. 16 of the manual and I'm confused about when to manually adjust trimming. The instructions state in flight I can adjust trimming depending on the aircraft performance which makes sense to me but then it says I should manually adjust the trim after the flight to "re-center the servos". In my mind this does make sense because when I fly again wouldn't the radio remember my trim settings but since I've manually adjusted it, the plan will then overcompensate. Am I wrong in that the radio doesn't remember trim settings every time I turn it on and off?

Does anyone know is it possible to put it into experienced mode on the ground and adjust the trim? I have a fear of experienced mode because the last time I did it in the air I lost control and crash landed. I think it would be easier now to adjust on ground before going up.

The radio does remember the trim setting. The reason to recenter the servos is that the gyro likes the servo to be centered. After a trim flight you set the trim back to zero then you put the trim back in by adjusting the length of the control rod. It doesn't have to be perfect.

Hello, as I am a beginner in it, nevertheless I found a checklist
- The radio does remember trim settings (mentioned in a comment above), but resetting the trim to neutral after the flight is a good practice to keep everything balanced.
- Yes, you can adjust trim while on the ground in Experienced Mode before flying, which can help you feel more confident and controlled when you take off.
- If you're still getting accustomed to experienced mode, practicing on the ground is the safer route.

I'm not sure about that. I've seen videos that suggest saving the trims to "subtrims" on the radio and model you're flying. Then when you fly that plane again, reset radio trims to center then you just reload the "subtrims" into the main trim settings, so that plane will be trimmed appropriately automatically for you by the radio. Thats what I plan to do.

I do the manual alignment of the pushrods before I fly the plane the first time so that with servos in neutral position, the control surfaces are visually aligned appropriately, But I would not go back and change that, unless for some reason trims cannot be easily set during flight to keep it level (rare). YMMV

You folks are worrying about nothing when a few clicks of trim are involved, just trim it and leave it.

You're talking about a practice that goes back to the days of mechanical trim sliders and going from model to model.

This radio does not have "subtrims". Those are stored settings that are recorded and applied even though the trim levers themselves are centered, in more advance radios.

One can leave the trim levers as they have been positioned for neutral flight, but if more than a bit has been applied, it will "unbalance" things a little. Likely not a big issue, but you may find differences in how it behaves in left vs right turns, or climbing vs diving. If you get another BNF plane that this TX can be used with, the trims will have to be redone for that plane - and your current settings for this one will then be lost. Or, you may accidentally move the trims, and not remember where they were (or may not notice they moved without the visual confirmation of "are they centered?"). So good to have the settings saved by adjusting the linkages in the plane, and always keep the trims neutral.

Because the gyro is trying hard to keep the plane level in the easier flight modes, trim lever movement will have reduced effect - what you put in will be compensated for by the gyro. This can, sometimes, cause one to overshoot the amount needed, and not know until the next time Experienced mode is chosen. Hence the instruction to trim when in Experienced mode in the air - so you get the correct amount needed.
Yes, afterward on the ground, put the plane into Experienced mode, with the trim levers positioned as they were in the air. Note the amount of up/down or right/left the trimmed control surfaces are deflected. Center the trim lever, and loosen the screw holding the pushrod to the servo. Move it as needed to get the deflection you noted earlier. Repeat as needed for the other channels.
You may not get it perfect the first time, or even the first couple of times, so take it up (any mode) and when straight and level, flip to Experienced mode and again trim as needed to keep it straight and level. Repeat the on the ground adjusting as needed.
The goal is to maintain hands off straight and level in Experienced mode (at 50% throttle) just like in the other modes. So if you have to flip in and out of Experienced (or use Panic) a number of times as you adjust the trim levers in flight, so be it. It is far easier to do on very calm days - wind in Experienced mode will make things harder.

Another advantage to centering the controls mechanically when the trims are centered is so the next time you accidently bump the trims, you can just recenter them (different sounding beep at center) and you are back in business again without needing a retrimming flight.