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11-19-2017 06:41 PM  26 months ago


Leeds, England

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Expo doesn't make it slower around center then suddenly jump up, it is a smooth transition!

Increasing the deadband in the FBL makes it much more difficult to control around center, trying to keep the heli still in a hover is almost impossible.
60% of the time, it works every time!
11-19-2017 11:14 PM  26 months ago
Pistol Pete


Seffner, FL

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💎Sustaining Member
DEADBAND... a means to keep servo from over-responding to a change in center pulse signal and nothing to do with EXPO, thus the DEAD part.

By increasing deadband, you are basically telling the servo to not respond until it detects a change of signal by Xµs amount.

Most servos centering pulse signal is 1500µs. So if you were to program 10µs of deadband, the servo will not respond until it detects a signal of either 1495µs or 1505µs.

Most if not all digital servos have a ZERO deadband and the ones constantly buzzing and or always hunting to find center. Especially if transmitter (or servo) has a dirty pot whos pulse signal vary constantly by even just 1µs (micro second), ergo an overworked servo.

Consider only adding deadband if you have a problematic centering servo with no stick inputs as opposed to smoothing (curve ratio) a servo response around center which is what Expo is for.

Two different animals...sort of speaking.
~~Enjoying the hobby one flight at a time~~
11-19-2017 11:33 PM  26 months ago
Heli Fanatix


Fountain Valley, CA

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Once again correct Pete!

I've learned that while setting up a FBL on a PC
- On the screen with inputs coming from TX
- if you're not at zero
- the numbers maybe be jumping from -1 to 0 to 1
- add Dead Band until everything zero out

Than I decided to add some Dead Band and put all my Expo to 0
- IMHO .. I liked the response
- direct & connected feeling
- like going from spektrum to futaba signal Latency

I was using Expo to eliminate the interaction of my sticks, especially for my left stick;
- it's tough to move collective straight up and down w/o feeding some left & right input into the rudder
- this gives you some "Wiggle" room
- center is offset to offset any possible interact
- 1 to 1
- Direct and proportional control

Adding Expo makes things smooth b/c it smoothens your input.
- look at the graph on the TX Screen when you add expo?
- is that line straight or curve?
- what happens when you add more?
- quickest point to A & B is a straight line isn't it?

if you can't feed the controls smoothly and deliberately, adding EXPO will let you achieve this.
11-20-2017 01:44 AM  26 months ago

rrKey Veteran

Planet Brooklyn, NY-USA

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I use loads of Expo for Precision hovering and it automatically lessens when Aerobatics/Idle conditions activate. But even still I use lots of it.RIP Roman Pirozek Jr.
Team Futaba USA
Team Kontronik USA
11-22-2017 09:09 PM  26 months ago

rrElite Veteran


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wow you guys love detail,( No Offence Intended) this is the beginners section LOL...

All a beginner needs to know is it makes the sticks less sensitive around the centre which when your first learning is a real help, especially for an Xbox/PlayStation generation... who are used to hard movements on a joystick/game controller. As you gain more stick time and experience most lessen the amount of expo used..

PS I'm talking about expo on the tx not fbl unit, as I fly with flybar
All The Best
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