Selective trim

Hi,

After using my DEVO10 for years, I have been flying helis and electric planes. Now, I am trying nitro birds.

I am trying to configure a trim but I am stuck now. If anyone has some idea, please give me some help.
So: I am setting up a plane with a nitro engine. The goal is to have a switchable idle throttle opening (i.e. at -70, or at 15%)

The THR has 3 mixers:
#1: simple THR 1-to-1
#2: GEAR switch, with MAX mixer, fixed value (-70), TRIM enabled
#3: throttle hold (from this forum) on RUD DR switch

So far so good, throttle hold closes all. When open, THR operates 1-to-1, unless GEAR 1, in this case the THR minimum stops at 15%,
so the engine will not stop when the THR arm is pulled to zero, it keeps the idle open.

But I want to have "trim" on the idle. I want to trim only the value of -70 minimum value, but leave the max value on +100.
And only if the I have enabled the GEAR 1 (idle switch).

I picked the upper left trim button for this. The goal is to trim ONLY mixer #2 and the trim should have no
effect on the other mixers of the THR channel (otherwise the endpoint setting of the carburettor servo is messed up).

So far I could set it up only so that when I use the trim button, the values are changing in both #1 and #2 mixers.

Any ideas are welcome!

Thanks,
bm

Nope, that was my first idea too. But just double checked it, to be sure and it trims mixer#1 too (#1 and #3 set to NO TRIM)...
I have tried it with CH1 and THR entered into the Trim menu too... maybe I am messing up something at the Trim menu?

Here it is.
It is a work in progress and full of junk, as I was trying many options...
Normally I keep it clean but this one became a struggle

Sorry, the idle is on ELEV DR, the GEAR will be flaperons.

Thanks for the help, much appreciated.
bm

Now this is strange... I have programmed a simple trim to VIRT8. Did not work. Copied (!) it to CH7. Works. Is it possible that trims only work with physical channels?

...and it works with NO TRIM too...

Thanks, I'll try this now.
"It" meant that regardless of the TRIM / NO TRIM setting in the bottom, the trim button modifies the value of the channel.

I've tried it. Getting there
The .ini gave -100 to 100 THR range with ELEVDR off. Trim does not count.
ELEVDR on gave -100 to 80. Trim works, but offsets top AND bottom values too. (example: trim of 3 clicks gives -97 to 83)

I don't know how you guys did this, but it works THANKS!!!!
(I'll try to understand it tomorrow, it is getting late here.... and my brain just shut down.)
It was actually an honor to be helped directly by You guys!
I'll post the finished .ini here when it is done.
Have a great day!
Cheers, bm

...and by the way, this is the bird that will use this .ini.

Köszi

Aaaand here it is.

I still don't get it fully, how it works and why did I need Channel 7 for the 6 channel receiver (without it, it does not work), but now it works as I planned.
-RuddDR is used for Throttle Hold. Closes carburettor completely, no matter what.
-ELEVDR controls the Idle. When THRHOLD is enabled, then it keeps the carburettor open at 15%, and can be trimmed (upper left trim) from 5% to 25%. Trim only works when this is active, so avoiding surprises and saving the settings (I have added this.)
-MIX controls the onboard glow ignition driver
-FMOD sets the control throws
-AileDR resets the counter
-There are 2 aileron servos in this plane. I have made one common virtual channel, so with modifying one mixer will effect both. In case somebody wants differential.

This could be a good tepmlate for glow planes

Cheers
bm