What is Expo? | Quick Tip | Motion RC

Exponential (Expo) is something that is sometimes misunderstood but super helpful to any and all RC Pilots

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#RC #expo #rctip

[friedlhochhaeuser]

After so many years in this Hobby, someone finally explained this to me in simple words!!! Thank you James, great explanation as always!

[flyboywbl]

People forget the original reason expo exists, to give a linear response to a turning servo arm. With no expo, the first 1/4 travel of the servo arm produces much more throw than the last 1/4 of servo travel. So while yes, it does lower the sensitivity around the center point, It also gives you more of a linear control throw response.

[peterfranks]

Very good video/ explanation of EXPO. 😊 Thanks. Five stars.

[castekracing]

Two years on you're still helping out! Very well explained

[johnsonsthsquadron]

Exactly what I need. I will have a whole line of edfs from you guys within a couple years. I have never had a straight definition of expo.

[Airguardian]

Here's some additional considerations: if you set up your aircraft with very neutral CG balance and large throws (typically for better aerobatic capabilities) you kinda want to boost your expo numbers, otherwise planes may be too twitchy and even unflyable. Also certain models (jets in particular) can have extreme sensitivity to roll, more so if you combine ailerons with tailerons and thrust vectoring nozzles, so adding expo may be the only way to retain a decent precision in your aircraft control without sacrificing full deflections that may still be needed for post-stall maneuvers.

[txkflier]

The servos that came with my first Kraft proportional radio system back in the late 60’s had a single linear rack output instead of a rotating shaft. Since the pushrod moved in a straight line at the servo and in an arc at the control horn, the control surface moved faster as it deflected further from neutral. That’s how expo works. My next radio was a Heathkit that used Kraft KPS-9 and KPS-11 servos which had dual linear racks and a rotary output. I preferred the linear racks due to the built-in expo they created. My next radio was a Futaba FP-T7FG/E which came with rotary output servos. The “/E” meant expo. Futaba also sold the radio as an FP-T7FG/K. The “/K” version had dual rates. They didn’t come with both expo and dual rates because they weren’t computerized; they only had one set of potentiometers. Since I liked expo better than switching rates, I chose the expo version. On my current Spektrum radios, I use a stick position switch on the rudder to put my elevator and ailerons into high rate for spins and snap rolls..

[Speedfly]

Me that never looked it up and always been flying in Zero mode, might just start useing it. Thank you! Ps. Only have the button Switch for "on and off" and no display. I better check the manual to see the amounds too.

[JeffsCustomRC]

Great demo and explanation James!! I personally fly with 30% on most planes and find it allows me to fly pretty scale especially with warbirds. Thanks for sharing 👊🏼👊🏼

[cccqxip]

As usual, straight to the point and helpful information!!

Thanks!

[KevinSebesky]

Great demonstration of an elusive topic. Nicely done, James.👍

[stigonutube]

cool Thank's for the video thumbs UP, now i understand that function, as beginner the E6 transmitter with E120S heli is super touchy in middle and got me correcting constantly "not fun" as beginner it is already hard enough, hehehe now to try this out at -20 exp tomorrow..

[Daniel_SWE]

These videos are awsome! I had so much problem understanding all the different settings when I started. 🙂

[reignman]

Expo is for ppl that learned with computer controlled radios, us old timers flew without it, but still helpful, lol

[Tickleme]

Great explanation, I'll have to learn if I need negative or positive on my Flysky thank you.

[kwcnasa]

Rc model plane tips, very important and useful, about expo (similar to Assetto Corsa gamma settings).

[graywoulf]

Thank you for helping me wrap my head around using expo. I will try it out for sure on my simple 3 channel foamies that I crash too often because I am not using expo. Should I use the same expo on both my rudder and elevator?

[joeflyer]

I have three E-Flite models, and all the manuals have recommended expo settings.

[wallicimo]

OUSTANDING explanation! Thank you much.

[ricardomaduro]

awesome illustration and explanation of this topic. Lovely ..