[ndnd]

Hello,
I've got cc3d on a 250 frame and throttle is MAD, at 20% it jumps into the sky and drops at 5%.
I need to tune the MAX to about 40% so the curve isn't so sharp,
I'm new to libre pilot parameters so please help me configure this

[ernstock]

I use the throttle curve on my TX to good effect.
Also a throttle curve in the GCS :
Configuration ,
Vehicle
 

[Zniggurat]

I have a custom throttle curve on my Tx and not on the GCS, so I can change it anytime I want

[Mateusz]

I never used throttle curve in TX, you should NOT definitely mix those with GCS throttle curve. I suggest to reset trims in TX, be sure you're NOT using them. Also check ESC calibration, are the output values reasonable ? Usually ~1000 is low, ~1500 is mid and ~2000 is high end, depending on ESC, but that's the most common range I guess. Then check PIDs, are you flying with default PIDs ?

It all looks like you have non-linear throttle probably messed up TX setup which you normally shouldn't need to touch.

[liftbag]

Welcome ndnd.
Why not to post a detailed description of your harware and electronics?
The topic would be much more streamlined and the solution (if any) would arrive faster.
Also, post your configuration settings: File > Export UAV Settings...

[TheOtherCliff]

If you are running stock sized props and battery, then it would probably be 1 of 2 things:
1 - your ESCs need calibration
2 - invisible oscillation caused by some PID set too high

There is a form of oscillation that is very fast, with small motion.  Often it can't even be seen.  We sometimes call it "invisible oscillation".  It happens if some PID is too high.  The result is that any throttle stick position above zero acts like it is closer to 50% than it really is.  In bad cases, all throttle stick positions above zero act very close to 50%.

If your quad climbs at 50% power then this makes your quad climb at lower throttle settings than it should.  You can tell that you have this if all your throttle stick positions feel like they are closer to 50% than they are (when flying).  Check 100% throttle too and you will find that it doesn't have as much power as it should since it is also being forced to be closer to 50%.

If your quad usually needs more than 50% power to hover, then it may not get off the ground at all if these invisible oscillations are happening, because even high throttle stick positions are closer to 50%.

For a test, reduce all PIDs by cutting them in half.  If the throttle stick now acts normally then you have these oscillations with your normal PIDs.

These oscillations must be removed from your initial PIDs before running AutoTune.

See the AutoTune wiki article for details.