M4 tries to make backflip

[valintinr]

Hello everyone,
After some testing with ext ESC I decided to build microcoper similar to Ladybird.
Motors - 8520, battery - 1S 450Mah, frame - lantian 110, radio - frsky xsr (ppm).
I reset settings to default and configured radio and motors, all other parametres keep unchanged. I didn't do any PID/Quatos tuning.
When tried to take off my quad maked backflip. I tried few times and all the times same behaviour.
I convinced that even with default parametres should be at least some fly even unstable but not flip during take off.
Maybe someone can advise what I'm doing wrong.

Parametres - https://files.tangram.biz/index.php/s/iUJPg6z1jpJdnFy
Video1 - https://files.tangram.biz/index.php/s/nSOqTVdaK7YZmqm
Video2 - https://files.tangram.biz/index.php/s/CfqAiYoxBgpRpqC

[LPR]

For me when this happens it means that I did something wrong.
You have the motors in the wrong order.
The FC board is not rotated to the right position.

I would hold the little copter in my hand and with the motor running above an idle tilt the copter and see if the motors change speeds as they should.

Larry

[aBUGSworstnightmare]

[valintinr]

All motors in the correct position and right orientation. Actually I checked this few time before but did it again. Board installed right - forward ext radio.

[bluuu]

can't be right if want to do the backflip

post some pics with your quad and mark motor numbers
mixer settings will be useful too for diagnose

[valintinr]

Made video - https://files.tangram.biz/index.php/s/4ODkdUFNpp19zoe

[JussiH]

[valintinr]

[LPR]

For default parameters I used the "LadyBird V2 configuration" file in the wiki and I found that my Ladybird quad flies quite well with those parameters.

http://autoquad.org/wiki/wiki/building- ... dybird-v2/

CTRL_FACT_THRO 0.800000011921
CTRL_MAN_YAW_RT 180

IMU_ROT -135
IMU_FLIP 1

MOT_START 0
MOT_ARM 0
MOT_FRAME 0
MOT_MIN 0
MOT_MAX 1050

MOT_PWRD_01_P 5.79595708847
MOT_PWRD_01_R 5.79595708847
MOT_PWRD_01_T 1
MOT_PWRD_01_Y -0.25
MOT_PWRD_02_P 5.79595708847
MOT_PWRD_02_R -5.79595708847
MOT_PWRD_02_T 1
MOT_PWRD_02_Y 0.25
MOT_PWRD_03_P -5.79595708847
MOT_PWRD_03_R -5.79595708847
MOT_PWRD_03_T 1
MOT_PWRD_03_Y -0.25
MOT_PWRD_04_P -5.79595708847
MOT_PWRD_04_R 5.79595708847
MOT_PWRD_04_T 1
MOT_PWRD_04_Y 0.25

MOT_VALUE2T_A1 2.46399998665
MOT_VALUE2T_A2 0.507000029087
MOT_VALUE_SCAL 3.5

NAV_ALT_POS_OM 1
NAV_ALT_POS_PM 1

QUATOS_AM1 -8
QUATOS_AM2 -50

QUATOS_L1_K1 18.6000003815
QUATOS_MAX_OUT 1.5

QUATOS_J_PITCH 4.09999993281e-05
QUATOS_J_ROLL 4.09999993281e-05
QUATOS_J_YAW 7.89999976405e-05


QUATOS_MM_P01 0.0430000014603
QUATOS_MM_P02 0.0430000014603
QUATOS_MM_P03 -0.0430000014603
QUATOS_MM_P04 -0.0430000014603

QUATOS_MM_R01 0.0430000014603
QUATOS_MM_R02 -0.0430000014603
QUATOS_MM_R03 -0.0430000014603
QUATOS_MM_R04 0.0430000014603

QUATOS_MM_Y01 -1
QUATOS_MM_Y02 1
QUATOS_MM_Y03 -1
QUATOS_MM_Y04 1

QUATOS_M_TLT_RT 1.5
QUATOS_M_YAW_RT 1.5
QUATOS_PROP_K1 200

SPVR_LOW_BAT1 3.11999988556
SPVR_LOW_BAT2 3.11999988556

[valintinr]

So I changed IMU_FLIP to 1 and fixed MOT_MIN/MAX/ARM/START and bird take off!!!
Im pretty happy and now time to tunig and I hope parametres would similar to ladybird.

P.S About MOT_MIN/MAX/ARM/START - as I mentioned in the first message I reset setting to default so thats why this setting wasn't right.