What is exponential and what can it do for me.

Exponential settings may be used to change the response curve of the servos to make flying more pleasant..you can make the servo movement less or more sensitive around neutral for aileron,elevator,throttle and rudder.......this according to Futaba set up manual..usually people just use dual rates as opposed to exponential values....the faster you go, the less throw you need for the same manuver......Rog

Exponential allows you to make the sticks on your radio less sensitive around center. This can be helpful if you have your control surfaces on your plane set up for large throws. This way, your plane handles a little more like it has mild throws when the stick is near center but the control surface moves at a higher rate the farther you move the stick from center.

I noticed that you have only 1 post, so not sure of your experience level. However, I have been flying 2 years now and still don't really like the expo setting. When I move my thumbs I want to see response. Now as I get bigger and faster planes, that will probably change, but for now, I use dual rates without any expo. That's just my recommendation.

I never use expo either. I do use dual rates to limit the throws somewhat. I personally don't see any value in using expo. Just learn to fly the plane and adjust the sensitivity by increasing or decreasing the control throws as needed. This can be done either mechanicaly or via computer radio.

Expo really doesn't limit control movement. It changes the amount of servo movement vs. the stick movement, but full stick throw still gives full servo travel.

Visualize this: Move the stick 1/4 of the way in one direction. Without expo, the servo moves more or less 1/4 of it's travel in that direction.

Now enter some expo, maybe 50%. Now with 1/4 of the stick movement, you get maybe 1/8 of the servo movement.

But if you move the stick fully in that direction, you still get full servo deflection.

It just makes servo movement "softer" around neutral, which is what many of us like.

It's sort of like infinitely adjustable dual rates.

That's a good explanation, but I already knew what expo is. I still don't find a need for it in my flying. Seems simple enough to not move the stick very far on a sensative plane. If you can't make fine enough movements, then go down to low rates.


I have two 6 channel computerized radios, one has expo, the other does not. For me, it is better to not use expo. I have talked t with many people, and some like expo, and some do not. I personaly don't find it useful, but some do.

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Expo is a feature to make servos more or less sensitive around center.

sorry i set a post on this quetion instead so i may get people who may have already hit this post thay may not return i need input

What do you need?