Help! APM 2.8 oscillating on my 6 inch, will climbs quickly, will drop upside-down if cut throttle in all flight modes

[SumukhaS]

Hi,
I recently ordered a APM 2.8, and here is my quad-x specification,

APM 2.8 oscillating on my 6 inch, will climbs quickly, will drop upside-down if cut throttle in all flight modes​

6 inch - qav250,
6045 props
simonK esc

I reduced my P stabilized from 4.5 to 4.3, but the problem got worse...

 

[Bricks]

What are you using for software Beta Flight or????????

 

[SumukhaS]

What are you using for software Beta Flight or????????

I'm using mission planner 1.3.71

 

[LitterBug]

I'm using mission planner 1.3.71

Mission Planner is on your PC, what version of ArduPilot (copter) is on the APM 2.8? Did you select presets for a 6" 250 quad? Did you calibrate your ESCs?

LB

 

[SumukhaS]

Mission Planner is on your PC, what version of ArduPilot (copter) is on the APM 2.8? Did you select presets for a 6" 250 quad? Did you calibrate your ESCs?

LB

I have calibrated my esc, and I'm using
3.2.1-FIRMWARE_VERSION_TYPE_OFFICIAL

I heard we have presets, but I'm not able to find them on mission planner.

 

[LitterBug]

APM 2.8 has been out of support for a long time and does not support the newer tuning features. It appears that the "old" initial tuning profiles may no longer be part of mission planner.

 

[SumukhaS]

APM 2.8 has been out of support for a long time and does not support the newer tuning features. It appears that the "old" initial tuning profiles may no longer be part of mission planner.

Is there anything I can do for atleast basic smooth flying with gps reliably or it's not easy to get it to fly. I see very few videos online for APM 2.8 with 6 inch

I have a f550 frame also where it flies okay, but with gps wasn't a smooth flight.
(I'm using bm880 gps + compass)

 

[Merv]

Sounds like you need to manually tune your PIDs. Record the current setting so you can return to them if necessary. Then turn the I &D to 0. Then begin raising the P until it begins to oscillate, then back it off slightly, 5-10%. Next raise the I until it begins to oscillate, the oscillating will be much slower than the P oscillating, then back it off a bit. The I will be somewhere about half of the P. Finally raise D until it begins to oscillate, the oscillating will be super slow, then back it off a bit.

There is likely a video that explains the process better but I have been unable to find one.

 

[Bricks]

Here is the best video I have seen on pid tuning it is a series.

 

[SumukhaS]

Thankyou soo much guys
It means a lot to me

I'll go through them and make necessary changes and get back once I have an update