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Almost all RC radio transmitters (Jumper, FrSky, Nirvana and all other OpenTX radios) have trims. When flying classical airplanes, their usage is obvious: you trim your airplane with trims. When using any flight controller or stabilization, they immediately become useless. Trimming has to happen on flight controller (INAV, Betaflight, Pixhawk, Ardupilot), not on the radio itself. Luckily OpenTX allows you do some tricks with trims:
* disable trims so they will not accidentally break anything
* use trims as 2 position switches and assign them to any radio channel
* use trim to reset flight and timers in OpenTX
The radio I use is Jumper T16 which you can get from
Aliexpress bit.ly/2JxYnai
Amazon amzn.to/2QXUnV7