Tx Dual-Rates-Exponential settings questions

[hghost]

OK I have a Tactic TTX650 transmitter. I am trying to learn the settings.

I have set the travel limits on Ailerons for example to limit it's travel. I have set to a percentage so they do not move so far...example 100% to 50%-40% etc etc

Now dual rates and exponential settings are a little confusing .

The rate of servo movement is non-linear in relation to the movement of the stick.The higher the exponential percentage,the quicker the servo will rotate as the stick is moved away from center........( that is what the manual states.)

Now someone explain to me in layman's terms how to set exponential settings .

I have some war planes for example that are always inverting in turns( every time as a matter of fact ) The ailerons move way to much and way to fast.

I have set them at a lower setting hopefully trying to compensate for that sudden inversion. ( Weather to bad to try it out) However bench testing the Ailerons do not travel as far ( using a Great planes Accu-Throw to show travel amounts )...My wonder is, can setting exponential settings, slow down that travel speed to make easier turns as not to make that sudden aileron movement that has caused inversion ? What i mean slowing down the servo movement to make that turn more fluid and slow and not so drastic and fast ? Will setting the exponential settings help ?

Would that help ? Hurt ? Cause issues ? Whatever ?

The manual about setting rates and exponential is not as clear ( to me anyway ) as i thought .

Any help, advice, whatever is welcome.

This Tx allows me to put everything on a switch as to be able to use or not use it.

I have set aileron and rudder mixture on a channel to try and get smoother turns for example.
( will not know how well until weather permits- but bench testing shows the control movements work as set )

Using the War Birds as an example. I have a High wing Decathlon and a Yak 12 as well that has ailerons I will try whenever weather permits. Have them set and bench tested as well, needing more info on Exponential settings trying to understand it more before setting it up.


Thanks in advance.

[toff]

The idea of exponential is not to slow down the rate of travel on the servo, it is simply a change of how much stick travel will adjust the movement of the servo.
EG: 0% expo-full right stick - servo travels fully. 90% expo- full right stick - servo travels only a tiny amount. Basically you can use more input, but dampen down servo movement. That's my take on it, anyway. Anyone else?....

[flydiver]

Watch this:
Dual Rate & Expo Explained www.youtube.com/watch?v=skU51E5ilG0

[flydiver]

Nov 10, 2013 8:56:28 GMT 1 toff said:

The idea of exponential is not to slow down the rate of travel on the servo, it is simply a change of how much stick travel will adjust the movement of the servo.
EG: 0% expo-full right stick - servo travels fully. 90% expo- full right stick - servo travels only a tiny amount. Basically you can use more input, but dampen down servo movement. That's my take on it, anyway. Anyone else?....

Naw, you got that wrong, or explained it poorly. EXPO does not affect TOTAL travel, but it does affect the % of movement around center. In effect it makes the sticks less 'touchy' around the center. The more EXPO, the less touchy. But there's a price.
At 0% EXPO if you move the stick 50% the control surface moves 50% of it's possible travel (linear movement). At 50% EXPO the control surface may only move 25% of possible travel with very little of that around the middle. BUT as the stick continues it has to 'make up' the 25% it lost so as you approach maximum the travel actually becomes more than with no EXPO. It 'ramps up'. You still get total set travel. To actually reduce total travel you need to make mechanical changes or travel adjustment changes in the TX. Dual-Rates can be very useful there.

Watch the video.

There is no 'magic' Dual-Rate or EXPO setting. It it completely dependent on the servos, the mechanical setup (control horn position), plane characteristics, and (most importantly) the pilot.

[toff]

Hand up!! Explained it totally wrong. I was trying to say ( in my own ham fisted round about way) that it dampens the sensitivity of the sticks ( and as a post scriptum, I haven't read anything on the subject, just what I've noticed using my DX6i - I personally only use dual rates, expo makes the controls seem 'sluggish' ( to me, anyway). Thanks for the correction, Fly.

[hghost]

Nov 10, 2013 17:13:40 GMT 1 flydiver said:

Watch this:
Dual Rate & Expo Explained www.youtube.com/watch?v=skU51E5ilG0

Video made perfect sense.On this Tactic Tx, it has an actual graph to show that movement. It also answered the + and - settings I was wondering about.

Plus it does slow down the servo movement or dampens it to a point to stop the fast movement, The video was explaining Heli and how so many
move the stick around to keep it level and not be so twitchy in flight, that was also my wonder while flying planes, seems no matter how easy
I seemed to be on the stick movement it still made the ailerons for example move way to far way to fast, causing that inversion so fast I could not react fast enough to correct it before it would invert and scare me enough to cause me to jerk back only to head into the ground.

The explanation made sense to me now and gives me understanding of the graph on this Tactic Tx I was looking at and what the terminology in the manual was explaining. This Tx and it's settings hopefully will allow me to make those stick inputs and limit travel Plus Slow it down or dampen that movement enough as to not invert the planes so easy ( my hope anyway ) This Tactic Tx can also be set for Helicopters if I ever decide to get more into them as well. I own one, but it flies really easy, just wont fly in the wind very well.... most do not.

Playing with the settings, hopefully before more snow flies here I will get a windless day to give them a try. have a few planes yet to maiden. Beautiful days just Way to Windy.Today it's 23-25 mph winds and gusting to 32+ at times, but sun shining and very nice otherwise. ( hate the wind )

Thanks everyone for your input. Fly as always your response is priceless.

[kenninny]

I watched the video and it explained DR and expos a lot better for me too, now that I have the dx6i.
I got right before day light saving time ended so I only used it once. now its getting dark, when
I get off work.