TRex 500 with Matek H743Mini which I’m just setting up. I did a couple of 5-minute test flights today to check for vibration, and I noted that I was having to hold a little bit of right roll throughout the flights. To counter that the wiki says, “… pull the log, noting the roll angle and pitch angle that you had to hold with the stick … Enter the roll value in the ATC_HOVR_ROL_TRM parameter in centidegrees. …”
The problem I have is my flight log shows stick positions in us, with an average for RCIN>C1 (roll) of 1577 for one of my flights. How does that translate into centidegrees for the ATC_HOVR_ROL_TRM parameter?
It’s not the stick position that you need to enter into the hover roll trim parameter. You have to enter the roll angle that you saw in the log in centidegrees
OK, I’ve got it now thanks. My average ATT>Roll was 4.37 degrees during that flight, so I’ll modify my ATC_HOVR_ROL_TRM value (which I think is 300 at the moment) accordingly and test again.
For a CCW turning main rotor you need negative roll (roll left) during hover. The parameter minimum value is 0, I would like to set it to -500 (-5deg).
What did I miss, why is the parameter limited to 0-1000 centidegrees?
Good catch. I will have to fix that. In the mean time, go to the full parameter list and change it. Even though the range says 0 to 1000, you can put any value in the field in the full parameter list page of mission planner. Refresh the parameters and check to ensure that the change took effect.
Great, thank you very much for such quick answer - and easy fix! I tried to set to negative using QGC, but it did not allow me to. Then confirmation bias made me believe I missed something else.
Now when I got some confidence back I’ll take the chance to ask if if there is a similar issue with H_YAW_TRIM? I want to set it negative, but parameter list says range 0 to 1. Same same?
@bnsgeyer, do you know if the same ‘issue’ yields for the H_YAW_TRIM parameter? Or should we call it an undocumented feature? Or can you point me in a direction to find the answer?
I’d rather ask someone who knows than try to dig into the code my self, I’m not comfortable there.
Regards,
I tried to set to negative using QGC, but it did not allow me to. Then confirmation bias made me believe I missed something else.
Or can you point me in a direction to find the answer?