This might be a dumb question… So I’ve noticed when throttling up that I’m not getting an increase in rpm untill about centre stick, then the throttle comes on fairly aggressively. I’m a very new fpv pilot so I wasn’t sure if this is normal and I just have to keep practicing? Or if there are settings I should be changing to smooth out the throttle curve? It seems about the same on the SIM and I am using a Radiomaster pocket if that makes any difference.

Check the “sweep” in betaflight in the rx tab.. see if it is smooth or if it “jumps” to the midpoint..

Also check around in your radio for curves assigned to channels that you may not be aware of. When I first got my tx16 I knew nothing about openTx so it took me a LONG time to discover there was an expo like curve assigned but it was buried way at the bottom of a long channel list that one wouldn’t ever see unless you intentionally scrolled all the way to the very bottom.

Throttle response will be different depending on your setup (motors, props, weight, voltage, etc). If you don't get much thrust until you are above 50% throttle, then sounds like you have a low thrust-to-weight setup, maybe a 1S whoop?

However you can adjust the throttle curve in BF rate profile to your liking, moving the midpoint and adding expo. Bumping up the mid point above 0.5 will give you more thrust response lower down in the throttle stick.

You could also adjust the throttle curve on the radio, but if you have multiple drones then that will affect all of them, whereas in BF it will only affect that setup.

Don’t forget throttle / motor percentage on start up

(04-Jun-2024, 02:09 PM)mstc Wrote: YThrottle response will be different depending on your setup (motors, props, weight, voltage, etc). If you don't get much thrust until you are above 50% throttle, then sounds like you have a low thrust-to-weight setup, maybe a 1S whoop?

However you can adjust the throttle curve in BF rate profile to your liking, moving the midpoint and adding expo. Bumping up the mid point above 0.5 will give you more thrust response lower down in the throttle stick.

You could also adjust the throttle curve on the radio, but if you have multiple drones then that will affect all of them, whereas in BF it will only affect that setup.

That is a great idea on throttle curve with BF.  I did mine in the Boxer Radio.  I flew my whoop last night and had issues with the throttle after copying it from my toothpick.  Similar issue to the original post, it wouldn’t do much until I got to center then it would rapidly accelerate.

I realized that I need to start out with angle mode until I get some more experience with these small quads.  I have yet to find a good source on actual rate settings.  I flattened out my yaw, pitch and roll curves and decreased the rotational velocities.  Not much out there on basic beginner settings.

Thank you all for the great info! I think I’ll start with the adjustments in the radio because it seem to do the same thing while I’m using the SIM. If I can just get that initial transition to power to be a little smoother it would help a lot. I’m sure many many more hours of practice wouldn’t hurt either lol

(04-Jun-2024, 09:04 PM)WattsFPV Wrote: Thank you all for the great info! I think I’ll start with the adjustments in the radio because it seem to do the same thing while I’m using the SIM. If I can just get that initial transition to power to be a little smoother it would help a lot. I’m sure many many more hours of practice wouldn’t hurt either lol

I use throttle curves on my transmitters. I tweak the curve until I am comfortable with the way the quad behaves. Every time I copy the model to use for another quad I go back and tweak some more. It is part of the hobby and the fun part.

If you get to have many drones and many radios (@seismic), trying to maintain a separate model for each drone and copying the models to each radio sound like a nightmare. I have a single model setup on my radio (one for each radio protocol, so for ELRS only one model) which will basically fly every single ELRS drone in my collection, and pretty much leave everything at default, so never any issues/surprises switching to a backup radio or even adding/trying a new radio. Any customization to throttle or rates is done on the drone itself in BF, so it gets applied regardless of what radio or model you use with it (just like customizing the PIDs).

Also its easier to adjust the curves on my PC screen with a mouse, than trying to squint to my 0.5" OLED radio screen and tiny buttons, but I guess you could run EdgeTX companion on your PC if you wanted to.

But I guess you get more options in Open/EdgeTX especially if you use multiple throttle curves, have multiple flight modes, maybe have a 3D mode, or some special mixing. But I prefer the KISS philosophy.

(04-Jun-2024, 09:28 PM)mstc Wrote: If you get to have many drones and many radios (@seismic), trying to maintain a separate model for each drone and copying the models to each radio sound like a nightmare. I have a single model setup on my radio (one for each radio protocol, so for ELRS only one model) which will basically fly every single ELRS drone in my collection, and pretty much leave everything at default, so never any issues/surprises switching to a backup radio or even adding/trying a new radio. Any customization to throttle or rates is done on the drone itself in BF, so it gets applied regardless of what radio or model you use with it (just like customizing the PIDs).

Also its easier to adjust the curves on my PC screen with a mouse, than trying to squint to my 0.5" OLED radio screen and tiny buttons, but I guess you could run EdgeTX companion on your PC if you wanted to.

But I guess you get more options in Open/EdgeTX especially if you use multiple throttle curves, have multiple flight modes, maybe have a 3D mode, or some special mixing. But I prefer the KISS philosophy.

All my transmitters will bind to all my quads. I rely on the name of the quad on each transmitter. I always keep the throttle curve the same for each quad across all my transmitters. That's just part of my hobby. Besides the throttle curves everything else is the same and the differences are in BetaFlight Configurator. Even that I try to keep them all the same but that is really not possible. 

I use throttle curves on the transmitters is because there are so many difference in battery/motor/ESC/weight combinations so each quad flies a little differently. I don't want to go back to the computer each time I want to make a change. The throttle curve in BetaFlight Configurator is not quite the same as the one on my transmitters. I can choose how many points I want and adjust each points on the curve. I have a throttle position on my OSD so I get an idea where my throttle stick is when I fly and I adjust the curves to accommodate that.

I am a staunch believer in KISS also but that is MY KISS. Anything else is too complicated for me. I only fly angle mode and use only 1 throttle curve for each quad.

With my recent experimentation with larger, more powerful quads I have started paying more attention to throttle curves and motor limits. I recently added throttle to my osd so I can get a better idea of utilization and make adjustments accordingly. I used to make a new "model" for each quad, so that I could tweak radio settings for each craft individually, then I realized I was doing all my tweaking in Betaflight. Now I use one model (with binding phrase) for all my elrs quads... Everything, except my earliest Moblite7s and Crux3s, is elrs now.

@SeismicCWave You can adjust your Betaflight throttle curve, as well as many other settings, directly from your radio, with osd stick commands or the BF lua script. I have found it invaluable when tuning.

(05-Jun-2024, 12:28 PM)drumgod Wrote: @SeismicCWave You can adjust your Betaflight throttle curve, as well as many other settings, directly from your radio, with osd stick commands or the BF lua script. I have found it invaluable when tuning.

Thank you. I tried to use the LUA script. A little glitchy so I don't use it. An epiphany hit last night. I just realized the reason why I use a throttle curve on my transmitter. I don't like turning on my quads as much as possible.

I have this paranoia about heat. I don't like hot motors, I don't like high core temperature on FC, I don't like high temperature on VTX. Yes granted every one said it is ok to roast them up to 70 degrees C. I just have this obsession about keeping things cool. Maybe because I had a lousy car as a teenager that constantly over heat from a bad radiator.

So when I tweak my quads I connect them to my computer only with a fan blowing air on the quad. So when I tweak the throttle flying I like to ONLY turn on the transmitter and tweak without turning on the quad.

Yes it is a bit extreme.

In another issue related to this obsession with over heat issue. How good is the cooling on a digital VTX if the quad is flying "slow" indoor.

So I set up my 3” toothpick and Mobula 8 whoop throttle curve in BF.  I had a throttle curve on my Radiomaster Boxer setup to a custom throttle curve.  I am trying to set my Radio TX back to default for the throttle.  Under Inputs for Throttle there are 4 choices for Curve: Custom, Expo, Function, and Diff.  I am pretty sure it is Expo as the default because that is what Yaw, Pitch and Roll are set as in the Boxer.  Screenshot below.

Thanks in advance.

(07-Jun-2024, 07:29 PM)Radworm Wrote: So I set up my 3” toothpick and Mobula 8 whoop throttle curve in BF.  I had a throttle curve on my Radiomaster Boxer setup to a custom throttle curve.  I am trying to set my Radio TX back to default for the throttle.  Under Inputs for Throttle there are 4 choices for Curve: Custom, Expo, Function, and Diff.  I am pretty sure it is Expo as the default because that is what Yaw, Pitch and Roll are set as in the Boxer.  Screenshot below.

Thanks in advance.

I am giving this question a bump. For anyone owning an ERLS TX, does BF throttle settings trump the throttle setting on the controller? I had a custom curve set up on the controller but decided to switch it in BF so I can tailor for quads as I get more. I believe the above throttle curve is set back to default on the Radio. It is a linear throttle curve. I added expo in BF to decrease sensitivity at center stick for my noob muscle memory. I also added a throttle limit.

Thanks in advance.

One will not trump or replace the other, they will BOTH be applied. The radio applies the radio curve when translating your stick input to the throttle channel signal it sends out, and BF will apply any BF throttle curve you set upon receiving the channel signal.

As for default radio curve, I believe it is just EXPO with 0 value (ie a straight linear response).