Has there been a change with EXPO

[mpjf01]

I have been using the EXPO function since the 80s to counteract my inability to move the elevator stick back and forward without moving the rudder inadvertently (mode 1). I use it to put a dead band around the rudder centre position.

After a year or so messing with multirotors I came back to my SBACH last weekend and noticed that I was getting rudder movement with tiny movements side to side when using elevator. So I went to the mixer and upped the EXPO percentage. I had to set it to 100% to get any noticeable dead band around the rudder centre, and even then it was so small as to be useless for the purpose. The rudder on this aircraft moves through probably 150 degrees so even small movements of the stick are noticeable. Changing the EXPO % didn't seem to have any effect except over 95% or so. I tried in the Inputs screen (no effect at all) and in the mixer.

Is there something else I have to do that I have forgotten in the last year to get EXPO to do what I want please?

[dvogonen]

Expo will never give you a completely true deadband. The output might be small when you move the stick, but it will still be there.

A perfect solution for you would be to define a custom curve and use that instead. You will be able to define a true deadband of exactly the width you want and how steeply the signal rises outside of the deadband.

[mpjf01]

Expo will never give you a completely true deadband. The output might be small when you move the stick, but it will still be there.

I'm not sure why this would be, but regardless, what exactly does setting EXPO in a mix actually do?

[Kilrah]

Reduces sensitivity at the center and increases it on the edges. See the graph on the radio.

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[mpjf01]

Reduces sensitivity at the center and increases it on the edges. See the graph on the radio.

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That's what I was expecting. What I wasn't expecting was no difference at all between EXPO set at 90% and EXPO set at 0, and an almost unobservable difference right up to 100%.

[Kilrah]

As dvogonen said you're not looking for the right thing... Even 100% expo will not get you any deadband. Expo allows you to keep precise control for small movements close to stick center while keeping the possibility of high max throws at stick ends.

And even if you don't seem to see the difference on the ground I can tell you that even 30% is well noticeable in flight.

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