For the past 2 month I'm using APM 2.5 with 2.8 firmware. I'm using HK 550 frame. Electronics from my old gaui (1100kV scorpion motor and it 15A esc).
It fly fabulously! Love it so much.
On last Monday I start build up my new setup for my Quad. My plan is to have high efficient quad.
My new setup as below:
Frame: old frame HK559
Motor: NX-4006-530kv from HK
Esc: Multistar 30A ESC(opto)
-I think this ESC doesn't have throttle calibration. I can't find it. It not as usual ESC
-Due to Opto type, I power up my receiver using APM power module.
Prop: Carbon Fiber prob 13X4 from HK
After all hardware put together, i update firmware to my APM using 2.91 version.
I done all calibration process as request.
Everything seem OK.
Flight Test Result
When i fly my quad, i found my quad not stable enough.
After I make forward flight, it getting worst. I need to hold forward pitch and roll stick in order to make it stable. My quad tend to move backward.
When I apply yaw, my quad tend to backward and tilt on the side.
After that, I make auto trim by push rudder 15sec as mention in the manual and hover it about 40 sec.
After done auto trim, it fly well when hovering.
Then I make some forwad flight.The problem come again.
It getting tend to backward. After a second it tend to the right. it getting worst.
Then. make auto trim again. It good in hovering, but after forward flight it lost the stabilization again.
After some test, i plug quad to mission planner. I saw in 'Flight Data' that my quad is not stable eventhough pysicaly it stable. I think this is the root cause.!!
Next, I re-upload again 2.91 firmware and make some adjustment on the PID as below:
1. Stabilization P rate: change from 0.145 to 0.09 (0.09 because I think my motor is big not like last time gaui 1100 KV)
2. I make 'Stabilize Control' can adjust to my ch6 knob from 4.5 to 5.3
I make field test again. The result is same eventough I increase 'Stabilize Control'.
The sad thing is the tip of my carbon prob getting tear off due to some crash during hovering and landing.
After second test, I plug again to Mission PLanner.
I saw in flight data my quad not stable again.....
I think there are some problem for accelerometer in my APM..
Attache is picture of my quad
Somebody please help me to give some idea for this issue??
What the actual root cause??