This is my first try for a X8 , my drone is flipping in random direction during take off (Mostly front and left)
I tried adjusting AHRS TRIM X AND Y but still same.
Motor Numbers, props numbering all are ok
RC/Compass/ESC/Controller calibration done multiple times , result is same
Tarot X8 Frame
Tarot 320 KV Motors
Tarot 1555 Props
Tattu 22000mah 6s lipo
M8N and M9N dual gps
Holybro Durandal FC
Flycolor 40A ESC
That’s not an X8 so you do have the right Frame Class. Did you test the motor order and direction with Mission Planners Motor Test? This is almost always the reason for flipping on take-off. And not to belabor the point but many have got this wrong even after stating they have “triple checked it”.
Yes Motor Numbering Checked multiple times with MP Motor test , running in correct order and sequence.
Props are also in correct order.
Im giving slow throttle to check if it flips or not , most of the time its tilting towards forward and left.
The strange thing is after adjusting AHRS TRIM_X and Y from MP to counter the tilt , sometimes it lifts off but i have to adjust the values by trial and error before each takeoff and most of the time even after adjusting values it tilts.
+1 for Daves suggestion of redoing the Accel calibrations, pay special attention to levelling the whole aircraft in every direction across the top of the motors/props then hit the Level Horizon button.
Then reboot and see if the HUD in Mission Planner is always working properly at each power-up, or is it showing tilted as soon as you power-up.
The accels are more and more wrong over time, if you are starting in level ground.
Thank you guys, i did re calibration today, i tried my best to level on each side (by balancing it against wall). double checked the props and motors and tightened the arms to ensure that are no vibrations.
, i also tuned the initial pid values (based on Shawn excel file the New Tuning Instructions Wiki Page) but still its leaning towards forward.
IMU heater values also changed.
On reboot the HUD shows that its leveled
At 40-50% throttle it wobbles and pitches down. as soon as it tries to pitch downwards i reduce the throttle.
Strange thing is , today i flashed px4 , it took off , no change in hardware or anything,
the only thing i did is flashed px4 , calibrated compass / accel , radio/esc (same way i was doing in arducopter) and on first try it took off.
i had a spare holybro pixhawk4 lying around , i replaced drundal with pixhawk 4 and it took off also on arducopter.
so maybe some issue with the arducopter support for Durandal?
It would be a really good test if you can load up Arducopter again and retest with that compass disabled:
Or even do the Compass/Motor calibration procedure - be careful, it could be dangerous.
EDIT: I think we didn’t check this earlier because it did seem like an Accel problem
Also try to use those updated IMU Heater settings and let’s see what a log file looks like
i gave around 50% throttle and it was going nose down
Takeoff weight is around 7KG
Tarot 4114/320KV Parameter:
Outer diameter: 46mm
Stator diameter: 41mm
Stator thickness: 14mm
Stator number: 24N
Magnet Poles: 22P
Wire diameter: 0.31mm
Motor KV: 320RPM/Volt
22.2V No-load current: 0.5Amps
Gear shaft diameter:）4.0 mm
Motor length: 32mm
Motor shaft length: 37mm
ESC Are : Flycolor 40A OPTO 2-6S ESC for Multirotors
Most probably the fimrware is SimonK.
Con. Current: 40A
Max. Current (10s): 50A
Dimension: 45 x 27 x 10mm
no other documentation i can find
One other thing i noticed when in Ardupilot , MOTOR_PWM_MIN and MAX is not updated after esc calibration , in PX4 its auto updated after ESC calibration to sepcific values like 1137(min) to 1927(max)
i tried setting them manually to 1000 (min) and 2000 (max) and do a calibration in ardupilot but nothing changed.
also one other thing is when i flashed px4 after ardupilot , no motors spin unless i do esc calibration even setting the pwm min and max didnt work (same case from px4 to ardupilot)
Shawn. there’s low-kV 22-pole motors running on 8-bit ESCs. Not reliable. I crashlanded a flat-8 in this configuration trying to capture sportscars burning tires because Paul Walker died a couple days before. So 2013, and probably on an APM 2.5
It wasn’t the octo’s first flight, obviously, so they kinda’ work, but I think I descended that day with 3 desynched motors and zero yaw authority.
Quick question (sort of noob question):
i have some spares 40a 6s blheli 32 esc’s lying around , would they work ?
They don’t have any added heatsink like the one currently installed and are quite small compared to the one installed
The modern ESCs are quite different to the ESCs from only a few years ago. Physical size is not as much of an indicator as it used to be.
In BLHELI ESC settings turn off Low RPM Power Protect and also Low Voltage Protection. Ensure your other voltage and current sensing if working correctly and accurate. You don’t want the ESCs deciding to shut down while the flight controller is still trying to fly and maintain stability.
The only real way to tell if they are going to work long term (more than 1 take off) is to put a motor, prop and ESC in a test jig of some sort and use MissionPlanner motor test or the BLHELI motor test to run the motor and prop for extended periods and try many high RPM/low RPM cycles.
@ThePara Yeah there’s plenty of cheap gear out there that probably should be illegal to sell these days