OpenTX Gas or Nitro Engine Setup Idea - Replicate Analog Throttle Trim

[@Rchelicopterfun]

Want to learn more about the hobby of RC helicopters? Please visit my website: www.rchelicopterfun.com

[@leosoto4174]

Hi John....this is a great tip; I could use it on my gasser helicopter

[@BigWillieFPV]

I seem to lose resolution too end of the throttle when I have the carb turned up

[@stevendodge7105]

Could also use the function < 0 so the mix only operates below mid throttle

[@dmendia]

Hi there, do you connect the thottle servo directly to the Pixhawk (or whichever flight controller you are using) or do you have an ESC between the servo and the FC? Thanks.

[@Rchelicopterfun]

Throttle servo plugs into the throttle channel output on the receiver. I don't use flight stabilization systems in my planes, so no idea how it would work with them.

[@decoybig]

Yes, tha same idea. Is there somebody who did combine Nitro/Gasolie Engine with modern FC (using Inav or Ardupilot)

[@henvan8737]

In OpenTX its possible to set the second idle input to have a limited curve so it only operates on one side of the throttle range, say up to 30% of the throttle range. Thus it wont affect the higher end of your throttle settings.

[@Rchelicopterfun]

In my short time (1 year) of using Open TX, I have found "if you can think it, Open TX can do it". There are also multiple ways usually of achieving it. What you are describing there seems very similar to how I've got mine programmed on this plane, you would just need to use a 0 to 30% curve for your idle one. But maybe I'm missing something obvious in your question. As I'm no pro at this, I can't say what other "ways" would work without testing different methods to see which works best; but to me, you could also use a logical function/s to deal with that. Ie. the less than or greater than function. Use a specific curve when the throttle is 30% or less?

[@Bzl_777]

How?

[@tonybeverley5406]

Hi there John I like your video on throtle set up very keen to do that on my x9d but iam wondering what reciver do you use in your gasers thanks.

[@Rchelicopterfun]

Currently has an FrSky X8R in it.

[@joaquim339]

do you receiver for gas plane??

[@bramesque]

Hello John, many thanks for this workaround. Do you know if this is possible with the new frsky tandem X20 with Ethos ?

[@Rchelicopterfun]

Sorry no idea.

[@Fredhobby]

hi, great video... i'm using radiomaster opentx, I can't find good curves for Trex 450L, I need throttle and pitch curves, normal and idl-up mode, could you please help? thank you

[@Rchelicopterfun]

All covered here: www.rchelicopterfun.com/rc-helicopter-tips.html

[@Fredhobby]

@@Rchelicopterfun thanks

[@darthflyer3427]

Will the Sr8 gyro receiver work in a gas plane? Some say no. Nice work on the throttle, like the knob function

[@Rchelicopterfun]

Sorry no idea. I don't run 3 axis stabilization in my fixed wing aircraft, only my helis. Many 3 axis stabilization systems for helicopters can't handle high vibration environments (such as gas), so perhaps the same holds true with some fixed wing systems as well?

[@dannycoelho1813]

Awesome video, I am currently setting up my first gas model. I have the qx7 and I'm going to try to implement your idle feature and engine cut. I'm having one problem that I can figure out. I can't get any output on channel one to control a servo. I am running the RX8R Pro receiver. I have gone back and forth in companion and I have tried googling it multiple ways and no dice. Any help would be greatly appreciated.

[@Rchelicopterfun]

When you check your channel monitor menu on your radio, are you seeing channel 1 output movement with stick movement? If there movement showing on channel 1 in the monitor, then the likely culprit is the RX. If there is no channel 1 movement showing in monitor, then there is some setting within the many in the radio that is not correct. With so many variables in OpenTX, it's hard to say what the issue may be without going through the entire setup first hand. I would restart at the beginning of the process. First the input settings, then the mix settings, then the output settings.

[@dannycoelho1813]

@@RchelicopterfunSalt thanks for the reply man, yeah I'm NOT getting any channel 1 movement in the simulator, or on the Tx screen. The only time I saw movement was when I hit my Engine kill/cut switch that was preset when I created the model. I did add a mix to the throttle exactly like yours for using my S1 Pot as the throttle idle. After that I got a little output, the servo would move but for example, it was only moving from the -90% position to the -75% position these movements occurred between 0% throttle and 100% stick position. Almost as if the small output signal would be enough if it were connected to an ESC for an electric setup, I don't know. Those values are approximate as I was watching the servos on the test bench. I'm still new to Open Tx and there is a lot of info out there. I try to do extensive research through all the available online resources before I reach out to someone for help. Again this is my first gasser using FrSky products. Any advice would be greatly appreciated. I will try to delete the model and start over.

[@Rchelicopterfun]

Did you use the add function for the second idle throttle mix? It sounds like its reacting as if you used replace instead of add, and the only output is from the small idle throttle curve as it's completely overriding (replacing) the main curve? Just a guess of course; as I said, there are so many variables with OpenTX, it's hard to figure out where the issue on a particular setup is without playing around with and seeing the settings first hand.

[@dannycoelho1813]

I deleted the title cut off that the software added during the initial model set up. I then added the mix line to the throttle works well. Although i don't get any output from my S1 Pot until it hits 40% clockwise rotation. Im not sure how to address that. Even if i set the pot to control a single servo during testing, it does nothing until I hit that 40%ish mark then the servo jumps to position totally skipping 0%-40%. If dcsu makes any sense. But thank you for your awesome video.

[@jasonhacker5988]

Hi just wondering if you could help me I'm trying to set a on/off switch for my ignition on my gas engine any help would be great 👍

[@Rchelicopterfun]

Servo controlled? Solid State? Other? Regardless of switch type, not much to it. You hook it to a free channel on your RX and program what toggle you want to active that channel in your mix menu. You'll also need an external ignition kill switch however - that is a rule at most flying clubs with all gas powered models. So the external switch would be wired in parallel with the remote switch so either could kill the ignition by grounding it to the engine.

[@unstablewindz9462]

I'm getting an X12 for wings , gliders . What's your range like with this transmitter ?

[@Rchelicopterfun]

I fly VLS, and the models start getting too small to see long before getting a low rssi warning. The lowest rssi reading I've recorded so far has been 55 so still plenty of range to go. In other words, I would lose visual range of the aircraft long before RF range. I would think range is comparable to any of the name brand off the shelf 2.4 GHz RC radio systems (1.5 to 2.0 km). Assuming proper RX antenna placement practices of course.

[@chadk4548]

Nice plane... I'm in to helis just got a x10 it took me like 4 days to get a bace setup I still got to diel it in

[@Rchelicopterfun]

If you're interested, here's one I did with a heli: kzbin.info/www/bejne/iGiaoJWmhdWserM

[@sparrow082]

Have you seen the frsky gas Suite?😎

[@russcole5685]

Are they any good for smaller gas engines, eg 15,20cc. I have read elsewhere that the fuel metering units are only useable on engine's drinking heavily. Eg 150cc and above

[@sparrow082]

@@russcole5685 I have no idea, I could never justify spending the $80 on one. I decided to run a smaller engine at 3/4 throttle on a full tank and timed it, then I knocked off 2 minutes and set my timer's accordingly so I always land with fuel in the tank.