A replacement for OTX Special Function 'Adjust Global Variable' activate with a switch position and Throttle Trim as Source?

[Bert]

Within OpenTX, it is fairly easy to setup a variable that is adjusted with for example a trim switch. A switch then selects that variable that then can be used in a mix.
Attached you see two Global Variables GV1 and GV3. As an example, GV1 has the ability to create aileron differential (CH1 and CH5) and can be adjusted in flight while selected with switch position SC- and adjusted with the throttle trim. I find this very practical as am using this to adjust in flight flap 2 elevator compensation for takeoff and landing, flaperons for takeoff and landing, tailerons, aileron to rudder compensation and differential - all with just 3 switches.
In Ethos, I figured this should be doable as well however so far, no solution in sight without the use of Logical switches such as a Sticky/ Edge. To me, the Adjust SF / var is as important as the Override.

 

[Wayne]

Well, in some ways Ethos made this even easier..

I did the same basic method in OpenTX as you describe. In Ethos I was pleased as punch to find I could do the elevator to flap compensation and set it to an unused trim switch right in the mix! When in the mix for your elevator servo(s) in the weight setting, just do a long push and you will have the option to set it to a trim. I think you can do this for most mixes. When you see the 3 little bars in the upper left corner, that means you can pull down a menu and this is one of those options.

I think you can do a hybrid method where you can use a switch to alter what action the trim is going, but I have not seen a need for that myself so have not dug in.

I used to use a fair amount of logic switches in OpenTX, but the only logic switch I use now is just to trigger a low voltage alarm.

Hope this might be of help.

 

[Bert]

@Wayne, yes you can open options for most of the Mix Source or Value inputs such as weight and select for example a trim tab or analog switch however I loved it that I could use just the Throttle Trim for everything just by flipping a switch. I tried Function Modes, free and var mixes to no avail as I am unable to assign 1 trim to represent different values. But think about flying a jet at 50-60 miles/hr and be able to fine tune all the surfaces /mixes with just the throttle trim - I miss it in Ethos.

 

[Wayne]

I hear you.. I usually only need to adjust the flap to elevator and I like to dial in the aileron differential. I always say I will then go back and lock in those value, but I never do, just leave them active.

You could have some dedicated flights to fine tune but might be a bit of a pain compared to what you are used to.

You might want to open a discussion on github about your goals. Either someone will know how to do it, or maybe it will be added as a future function.

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You will have direct contact with the developer there. You don't get to say that very often.

 

[Bert]

Thanks Wayne. Am sure our voices are or will be heard. And am definitely with you on never locking in trim values. I leave them active too - it's just nice to have the possibility tweaking them anytime you want and with me that happens a lot. I never seem to get a bird perfectly trimmed out especially flap to elevator and flaperons in takeoff and landing maneuvers.

 

[Wayne]

I usually have my gliders dialed in for flap to elevator on the first flight. The only time I have had to change this is when flying from a slope at about 10,000 foot elevation. I forget if it needed more or less elevator, but it did need to be adjusted.

But when it comes to aileron differential. I'm not sure I ever get this one dialed in. I think I automatically dial in a little elevator in my rolls, thus I have a hard time getting this one perfect. (Is there any perfect?)

I thought it interesting when flying in a Cessna or similar small plane that they do not automatically adjust the elevator for the flaps. Instead the pilots get to adjust the elevator trim wheel. Most lack differential in the ailerons also. Heck, how about some CROW mixing on some of the STOL designs? I know - keep it simple..