I'm having trouble trimming elevons when using the ELEVON_OUTPUT mode. I have all surfaces moving in the correct manner, my only issue is with trim.
There is NO mixing configured on the TX.
The procedure I have followed is thus,
1) With ELEVON_OUTPUT = 0 (disabled), and in manual mode, I have adjusted sub-trim and end-points to accommodate the mechanics of the wing. In this mode I can correctly position the left and right elevons independently using aileron and elevator, and both are properly centred at centre-stick.
2) Calibrate RC, this stores the correct neutral values in RC_TRIM, and endpoints in RC_MAX / RC_MIN for all channels, but only 1 and 2 are important here.
3) Set ELEVON_OUTPUT = 2, now channels 1 and 2 are synthetically generated at ALL times, even in manual mode.
Unfortunately, in both manual or FBWA modes, the RC_TRIM (and presumably RC_MAX / RC_MIN) values are ignored; the elevons move to the centre-position they would have without sub-trim. Any synthetically generated output needs to be subject these tuning parameters.
Is there a setting I have missed? Or is ELEVON_OUTPUT not able to use the trim values (which would make it useless as far as I can tell, unless you are lucky enough that all your servo horns happen to align correctly).
Also, is it important which elevon (left/right) is connected to CH1 / CH2, it seems that the four modes for the ELEVON_OUTPUT accomodate either orientation.