Negative spoileron differential?

[theailer]

Hi!
I have a model with ailerons acting as spoilerons but I can't quite figure out how to do negative nor positive differential for the spoilerons ?
Neither could I find it in the forum either.
Im using spoilerons on a fixed setting on a switch.
Thanks in advance.

[Rob Thomson]

You may want to consider using open9x as it has a proper differential feature built in.

Yo can achieve the same thing with er9x, but it takes a few mixes!



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[theailer]

Thanks!
I did try open9x but gotten quite used to er9x.
I might try switching over again tho. When you say a few mixes, how many do you mean?

[Rob Thomson]

From memory.. Under er9x it was 2 mixes per surface.

You have to apply a curve that applies for each half if the stick movement. (The video guide shows how this is done)

No major issue doing it that way... But of using a full house glider you quickly run out of free mixes!


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[theailer]

I already have the mixes setup so it applies to each half of the stick movement with the ailerons, but what I can't figure out is how I can make the aileronservos not move up at all when I have my spoilerons deployed.
So when I flip my switch to deploy the spoilerons I want the ailerons to only move down, no upward movement at all.
Sorry if I was unclear or don't understand

[MikeB]

I asked elsewhere, but got no answer. If you want differential on an aileron, you just use a single curve that is different on each side of centre don't you?
You need two mixes, one for each channel driving each of two aileron servos. Each has a curve setting the differential.

What uses up mixes?

Mike.

[Rob Thomson]

That would work...

The video tutorial describes differential as requiring 2 mixes for each servo, one for each size of the stick.

On a 4 servo wing, and this would result in a total count of 8 mixes used.

I wonder if this whole question on differential has come about from the video guide showing something complex for a simple job?

Rob

[MikeB]

And if you only have an aileron to control on a channel (not flapperons/spoilerons) you can just set the limit on one side to a smaller value than on the other.

How many ways do we need to do the same thing?

Mike.

[Rob Thomson]

And if you only have an aileron to control on a channel (not flapperons/spoilerons) you can just set the limit on one side to a smaller value than on the other.

How many ways do we need to do the same thing?

Mike.

Well limits are not a good way

For simple differential yes. But add spoilerons or crow to the equation and you actually need full movement to achieve what you want.

But we digress... and are not helping this chap solve his problem.

Rob

[MikeB]

Back on topic, try:

CH01: + -100% AIL
CH01: R +100% AIL offset(100) switch(AIL)
CH05: + -100% AIL
CH05: R -100% AIL offset(-100) switch(AIL)

The first mix on each channel is the standard aileron control, two servos moving in opposite directions.
The second mix is activated by the aileron switch, and replaces the first mix when active. The offsets cause the spoiler action, and each aileron just moves down to the centre position.

Does this do what you require?

Mike.

[theailer]

I worked it out using different curves for the spoilerons, thanks!
Example:
C1 -100 -100 -100 0 100
C1 100 100 100 0 -100

CH01: + -100% AIL
CH01: R +100% AIL switch(AIL) C1
CH05: + -100% AIL
CH05: R -100% AIL switch(AIL) C2

So when I switch my spoilerons on I have them full up at mid stick. Stick full left makes the right aileron go down to it's full extent but the left aileron stays at the same position and acts as a spoiler. So simple when you know how
Thanks for making me understand.

[MikeB]

Always good when you understand how things work. For your requirement you can also try:

CH01: + 100% AIL
CH01: + 100% AIL offset(+100%) switch(AIL)

No curves needed, the second mix uses the offset to get the spoiler function, and because it is added to the first mix, it doubles the movement. Limits prevent the movement in the other direction.

Mike.

[theailer]

Hi again.
I've been away working for a couple of weeks so I haven't been able to fiddle with my RC stuff.
The way I have it setup now with curves I can't use the slowdown feature, so I'll try MikeB's offset and limits and see how good that works.