OpenTx Companion Tutorial • Curves: Throttle, Flaps, and Gain Curves How-To • [Beginners]

[@FASTFREDDIE-R.C.]

This is the most complete explanation of curves on the internet that I’ve seen.

[@RCVideoReviews]

Awesome! Thanks for the endorsement :)

[@audiogek]

Probably true, I've just watched a few trying to figure out how to set throttle at -75% to 100 with a curve under a switch. But no answer why my curve didn't work like I wanted to. Had to change "multiplex" from "add" to "replace" at the mixer screen. Wanted "idle up" under a switch for some old toy drones, they tend to stop the propellers and drop out of the sky at -100 throttle. Not really helpful when I'm teaching a non-gamer, never flew anything friend to fly.

[@hirenbshah]

Opentx dev team should include these tutorials on their website for newbies to benefit. These tutorials are one of the best for beginners. Big thumps up 👍

[@RCVideoReviews]

Very nice of you to say so. Thanks. Glad you like them.

[@mrreddog]

I was struggling with my flap servo at full end stop with flaps level to wings setup on a 3 pos. switch. Position 2 & 3 were driving flaps much too far down. I added a 3 point curve to keep flaps up at -100, then pos 2 @ -70 for medium flap, then pos 3 @ -55 for full flap. New model wizard puts flaps on mixer page, and this was the key to customize flap end points without overdriving flap surfaces. Figured it out on my own, but with this video, it gives me relief & confidence knowing this is acceptable practice. Thanks John, keep up the great tutorials, your video's are the best source of info without all the crap, right to the point.

[@RCVideoReviews]

Thank you. I appreciate the kind words. Glad to help.

[@ernestostrman5147]

I crashed T28 1.1m yesterday and decided to add flaps to the wing. After asigning flaps to a 3 way switch, my flaps are moving way too much, especially in full down, almost 90° against the wing 😂. Then i said to myself, go watch rcvideoreviews and learn curves.

[@F96-t6s]

I fly quads and this is precisely what I needed to know. Subscribed :-) Your no holding back on technicalities is VERY much appreciated.

[@RCVideoReviews]

Glad it was helpful!

[@carnotasnotas8883]

Again thank you very much. I am learning a lot with your videos through the translator. I'm sorry I don't know your language.

[@RCVideoReviews]

Glad to hear that.

[@robertheim352]

Thanks much for your tutorials and advice. Your videos are the best I've found. I'm new to this hobby of RC and find it strangely challenging, as a retired logic and electrical designer. It seems there is no top-down guidance for these machines but some detailed examples like yours. There are so many layers to the transmitter control functions, and I haven't even scratched the surface of receivers, gyros and servos... ranges, characteristics and feedback loops.

[@RCVideoReviews]

You're welcome. Glad to help.

[@ernestostrman5147]

Work you do is amazing. Your videos made me buy TX16S. You are an excellent teacher(dunno better english word now).

[@RCVideoReviews]

Thank you for the kind comment. I'm glad my material has been helpful to you.

[@fpvcrumudgeon4576]

As an applied mathematician, I sometimes forget that some were not born with an understanding of functions! lol You did a wonderful job of absolutely cutting through all the nonsense with a dash of humor. lol

[@RCVideoReviews]

I appreciate that..Yes, not everybody is a math whiz, so it can be helpful to simplify.

[@DirkHundertmark]

Well, there is the concept of a function and then the graph of a function. When one digs in deep enough (not too deep, though) one realizes that the true definition of a function is given via its graph.

[@stevebarrow3042]

Love that this radio can do dead band curves so I can add a little dead band to my aileron and elevator controls to stop minor interactions

[@124MPH]

Very well explained I have learnt a lot from this video, nice mate.

[@enzok6414]

The OpenTX University should hire you as a professor. You lecture better than 80% of professors I've ever encountered. lol

[@RCVideoReviews]

Wow, I'm humbled. Thanks. ;)

[@shanejohnstone4245]

Another great video in the series. Well explained and very helpful. Thank you!

[@RCVideoReviews]

You're very welcome!

[@BrianRamseysg01]

Handy way to keep throttle steady when input rudder movements I shall use this probably on all maidens... thank you Jon.

[@RCVideoReviews]

You're welcome. Curves are awesome ;)

[@BrianRamseysg01]

@@RCVideoReviews they are the controllers, of so many things them curves some girls have them set to 36 24 38 too ;) lol

[@RCVideoReviews]

Yessir!

[@MrZeek101]

love the retro intro lol and I pretty much changes all my 5 point curves two point on my sliders so much simpler great demo

[@RCVideoReviews]

The two point curve is a great tool for things like flaps and gain knobs because all points in between are averaged for you automatically. When I realized that I smacked my forehead.

[@RCVideoReviews]

Oh, and I dug out some of my old intros just to mix things up a little and Dave--long time supporter--said he missed the intro with the battery fire. That one is coming up tonight @ 8 :)

[@llarez905]

Great video! Trying to set up pot S1 for pitch curve trim and S2 for throttle curve trim. Have an older heli with collective pitch setup, everything works but cant get the pots to work. I want to be able to adjust for example the normal pitch and throttle curve? My radio is TX16S MK1. Had a JR radio when i was younger and that radio had trim pots for those things built in.

[@clean1566]

I better start from the beginning of the video series. I was trying to locate how to set up 2 stage flaps on my Jumper T16, since it will only go down half way. I don't know what I did when I rebound, but it used to go all the way down. I watched this video, and I get more confused, but understand more.lol This open TX is killing my brain!

[@RCVideoReviews]

Flaps should be really easy: 1) Create a 2 Position Curve. Call it FLA. Set one side to -20, the other to 20. 2) Add a switch on the Channel to which you've connected your flaps. 3) In the switch, apply the Curve. Once you've done that, your flaps should travel the distance of the curve. Use the curve values to set the endpoints of travel--full up and full down. Once you've done that, the middle position of your switch (or pot) should always be half of the total travel. If you want something more complex, make it a 3 position curve and put the middle point on the vertical axis at the travel position you want. As long as you don't set your servo endpoints to push the flaps past their stowed position, you really can't hurt anything. So just play around with it. Use your channel monitor to help. If you use Companion, it gets really simple and really fast to tinker. J

[@BikingVikingHH]

0:55 hey, that’s me! And for the record, that is what I sounded like as I was talking to your video in my living room lol

[@RCVideoReviews]

I figure if someone stops what they're doing, clicks on the comment section and says "wth are you talking about" then more than one person is thinking it. So, it had to be addressed.

[@BikingVikingHH]

RC Video Reviews You sir, are a gentleman and a scholar.

[@RCVideoReviews]

Hey man, there’s no reason to get nasty... 😁

[@enriquekramer4590]

Another great video!!! I use d eadband when flying my Ahi glider with flaps enabled in the throtlle stick. Since they move both up.and down, I know that around the middle.they are at zero degrees -neither up nor down. Very helpfful!

[@RCVideoReviews]

AhHAH! I knew one of you deadband guys would make an appearance. Appreciate the comment. Thanks for checking in. I used to use deadband on my offroad electric race buggy to manage the throw distance between brake and throttle. I've been thinking about a way to use it for reverse thrust. The Castle ESC has an auxiliary wire which lets you reverse the motor. I'm thinking a brake to deadband at -90 then deadband to -95 and reverse less than -95 might be something fun to try on an F3A or 3D plane.

[@enriquekramer4590]

@@RCVideoReviews Great idea! Now, I have to buy a Castle ESC and the programming USB.

[@erad05]

Thank you again for this tutorial. I understand that curves can be or are like Exponential settings where the output is not equal to the input, but can be set in open tx free, to suit your needs. Maybe I'll use these some time. For now I'm more busy with basic set ups. Until now I only have experience with Spektrum Radios where you have very little possibilities. But on the other hand less time consuming programming to do, to get the average flight setup. At least for my abilities.

[@RCVideoReviews]

It only has to be as complex as you need it to be, but it scales like nothing else as you've pointed out.

[@backrdfpv705]

Great vid! I made a 2 point -100 curve for throttle cut, copied my throttle in input and assigned the source as thr stick and the curve to switch. It highlights the switch but doesn't do anything to throttle output. Thanks

[@RCVideoReviews]

I've never used a curve for throttle cut, I always use a special function for a basic throttle cut: Special Function1 SF down Override Ch3 ON Use any SF slot you want. I use Switch SF in the down position. Throttle is on Channel 3.

[@juniorwest5706]

I'm a new sub and working my way through you videos , I only fly helicopters so a lot of this doesn't apply , but the technology of these open source programs are fascinating , 😎👍🚁

[@RCVideoReviews]

Thanks for subbing. You're going to have to have the adaptable mind. You learn what the radio can do and how it thinks, then you'll be able to use it to your advantage on helicopters.

[@capnhardway]

I just want to know what receiver is compatible with the radiolink buyme-A gyro while connecting with atx 12! Thus is maddening for a newbie..

[@bstearn1653]

Great video!

[@RCVideoReviews]

Glad you enjoyed it

[@robertwioch3691]

Hi! Very good Information on the radio. This is Robert Wioch. I will give you always a Thumps up. you are the best out there. AAAAAAAAAA++++++++++ :))

[@RCVideoReviews]

Thanks again!

[@124MPH]

Thanks!

[@RCVideoReviews]

You're welcome, and thanks for hitting the tip jar.

[@renePHTR]

hi folks. i have ONE Question using different curves: i would like to use the 6 push buttons to set the different curves on 3 channels ...i do not get it baken to do this...and what are the modes which are to be seen when you enter the AETR settings...it is mode 0/1/2/3/4/5/6/7/8...what does that mean and is this possibly the way to get a functionality like i want. So i would like to have depending on the "flight character" i want that time e.g. push button 2 for a different curve for AER channels...best regards...René

[@mekim1965]

Kids in math class are always asking why would I ever use this math principle, this would be an interesting example that may spark their interest.

[@RCVideoReviews]

Real life examples always got my interest throughout my college career. When I could apply what I was being taught..that was an attention grabber.

[@markb9896]

Thanks for the info! I am desparately trying to solve an issue with my TX16S where I really don't get any throttle input until about 30%-40%. There is just a huge dead spot and the sticks are calibrated, I checked the movement in the outputs tab and everything moves from 100% to -100% but I still have this issue with the throttle. Do you think adjusting stick low threshold and stick high threshold in BF will help with this?

[@RCVideoReviews]

Did you calibrate the ESC?

[@markb9896]

@@RCVideoReviews hmmmm it's been a while since I even thought about calibrating an esc! So no not recently but I can give that a try if you think it could help, thanks.

[@alessiopisu5709]

Cool video,but I'm still not able to easily modify my throttle curve. I mean,I create a 5 point curve like yours,really easy also to assign it on the input menu but,the main issue is that I can't see the Y axis moving when I'm creating my custom curve! At the minute 6:40 when you move the throttle you can see exactly in which point of the curve you are,but unfortunately you can't do that on the curve menu while doing the curve. This is a problem when I am setting accurately my throttle curve on my gas 100cc engine while it's powered on,because I don't see (on the curve editing) the stick movement so I have to go casually trying to find the exact point that I wanna modify. Hope to be clear,sorry but english is not my first language. Thanks in advance for your help!

[@RCVideoReviews]

This seems more like a statement than a question. You can modify the curve, you just can't see how your stick aligns to it while editing. Unfortunately, I don't know of any way to resolve this. You may just have to go with trial and error. Remember this though, from the inputs screen while you're looking at the curve, you can long press the name of the curve to go to the curve editor. So that at least makes navigating back and forth fast.

[@flywithtb5005]

What if I want to use a switch for the flap position but I do want to to have a smooth transition from one position to another in like one second transit time. You know what I mean, so the airplane wont change its handling characteristics to rapidly.

[@RCVideoReviews]

I'm going to make a snippet for that. Hang tight.

[@flywithtb5005]

@@RCVideoReviews Got it now. In the mixer there is a transition time option. Found it when I wanted to set it up without timer. Anyway gonna hang tight

[@ScraggleJackFPV]

🙏How can we get your “Curve generator” ? I can’t see a link anywhere.

[@RCVideoReviews]

The curve generator is built into Companion.

[@ScraggleJackFPV]

@@RCVideoReviews 🤦🏼‍♂️. Oh boy! I couldn’t even copy or delete my curves before, now I can do everything i wanted etc etc. THANK YOU! ❤️

[@witneydiggersrc3251]

Excellent tutorials. I realise the principles must be the same but, still confused. The Excavator sticks start from the centre. In addition to the movement there is hydraulic pressure to contend with so curves are definitely very useful but sorting out the curves is less than clear. I cannot see the wood for the trees🙈 should have got a plane!

[@RCVideoReviews]

You should join discord discord.gg/jSFTASU It's more dynamic and can help with questions like this.

[@witneydiggersrc3251]

@@RCVideoReviews hi, thanks for that, have joined.

[@witneydiggersrc3251]

Excellent 👍

[@RCVideoReviews]

Thank you!

[@drspyqwerty]

Comment

[@jeffjorczak]

I thought this was going to be about female pilots.

[@RCVideoReviews]

Then hopefully you learned two things ;)

[@carnotasnotas8883]

Again thank you very much. I am learning a lot with your videos through the translator. I'm sorry I don't know your language.

[@RCVideoReviews]

Glad to help.