Hi I made a drone using pixhawk cube orange with tmotor 14inch propeller, The MTOW of the drone is 3kg , the drone crashed during autotune , i cant able to figure out the reason , and i althold mode my drone keeps on moving to its left , can anyone help me to sort out the issuse , and may i know how to do a autotune without crash, this is my 4th crash
https://drive.google.com/drive/folders/1rQaTHkbrxjdhMBEMoFk_6dxJ6idJmzKD?usp=drive_link
You’ve got you own thread going now so that’s a good start, we can keep adding to this.
I seriously suggest using the Methodical Configurator GUI and stepping through that in a detailed manner. It will guide you through checking and fixing some of the issues before they get a chance to cause another crash.
In the Autotune crash log, the logging all just stops mid-flight which means the flight controller completely lost power.
The yaw/drifting problem is because you have a serious motor mount or frame twist, making the CCW motors work hard to counteract the yaw bias caused by the CW motors.
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Do you think it could be the CG issue?
No, or the motors with high outputs would be next to each other, like 1 & 3 , 3 & 2, 2 & 4 or 1 & 4.
Even if it was a CoG issue focused towards just one arm, you’d see motor 2 with very low output and motor1 with high output, and 3 & 4 would be splitting the high and low output almost perfectly up the centre.
When it’s 1 & 2, and 3 & 4 motors across diagonals (on a quad) then it’s definitely motor mount twist, caused by one or more of the motors with low output. In the log I checked the frame type.
I think that about covers all scenarios 
I agree totally, interestingly, user seeing does not tally to the log. the log suggests potential yawing.
The copter is doing almost everything it can to counteract the yaw bias and still maintain altitude and attitude - something is bound to give.
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As @xfacta said firstly the steps to configure correctly for your drone. secondly, the experts cannot do it remotely for you that is you have to achieve low noise and vibration for your drone at Alt-hold mode before quick tune or autotune can begin. then high chance your drone will fly much better to your expectations. Of course, the components you use match the thrust-weight ratio. The quality of the parts contributes to the results.
something like that.
you may have to find out your ESC/Motor PWM operating range.
MOT_PWM_MAX,2000
MOT_PWM_MIN,1000
MOT_PWM_TYPE,0
Not sure if it was caused by your 1st autotune failure or incomplete, not the default.
ATC_ANG_PIT_P,8
ATC_ANG_RLL_P,8
ATC_ANG_YAW_P,8
data collection for the Harmonic Notch filter to work is not set up correctly for the CubeOrange.
INS_LOG_BAT_MASK,0
INS_LOG_BAT_OPT,0
suggest leaving this default first. EK3_SRC1_POSZ,1
Reset all to default and start over. Fix the mechanical Yaw bias as suggested and then use The Configurator.
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i have configured a drone using methodic configurator , when i armed and gives throttle up ,i totally lost its control , the drone suddenly moves upward and when i gives throttle down it hits the ground and crashed and i fell its not userfriendly
This will happen in Stabilize mode if you are inexperienced with a multirotor. Or if it’s just misconfigured.
User friendly? That depends on the user.
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No , i takeoff in loiter mode, I will try to learn methodic configurator .If possible anyone can post a youtube video on how to use methodic configurator , that will be more useful for new learners like me
I don’t believe there is one. I think it get’s a mention here : Full ArduCopter Configuration in less than 1hr
Loiter doesn’t work reliably until you have tuned altitude control loop and done autotune for attitude and position controllers.
So, wait, have you done this step? You post Autotune log file, you seem telling everyone you have done this step.
as you posted in one thread , i have done fft autotune and Harmonic notch setups , but after post filter i dont know whats my next step ,but after doing fft autotune , the oscillation in my drone were gone , but after few mins of hovering when i tried to pitch forward my drone at high speed and releases the stick , the drone begins to oscillate highly ,And i didnt get a proper data about manual tuning yet , can you explain about manual tuning , i feel in arducopter document the manual tuning is not explained much , can you please help me out of this ?
https://drive.google.com/drive/folders/1Y1L1duNwA-j4-rbTZfE9lan7I6jsUc7r?usp=drive_link
You dont need to worry about manual tuning and FT’s yet - just fix the physical problem cause serious yaw bias, and find out which unreliable connection caused the flight controller to lose power.
Then you can go back to basics and start over like it’s the first flight.
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yes ,will do and update you asap, but can you please explain what to do after FFTautotune
yes sir , there is some problem in motor mount ,it gets twitsed while its in air , and the flight controller lost its power due to pixhawk cube power cable from power module is not working properly , now i made a new structure and will update you log asap
The ardupilot methodic configurator explains exactly the sequence of steps to execute and the relevant documentation for each step.
No need to read all of ardupilot’s documentation, just the documentation relevant for the step you are currently configuring. It’s a typical divide and conquer approach.