Problem Auto takeoff

ArduPlane
1

Hello Guys, need help

FLYWING with elevon, Firmware 4.2.3 no Airspeed sensor and use Ramp launch
In manual ready takeoff without problem.

the problem is during AUTO TAKEOFF the plane remain flat not make UP elevons, in the log file i see Pitch 14 degress ( inclination of ramp) and Desire pitch only 5 degrees ?!?! why
i need from 14 to 20 degress i set TKOFF_LVL_PITCH,23 not 5.

STALL PREVENTION = 0

THROTTLE_NUDGE,0
TKOFF_ACCEL_CNT,1
TKOFF_ALT,50
TKOFF_DIST,100
TKOFF_FLAP_PCNT,0
TKOFF_LVL_ALT,20
TKOFF_LVL_PITCH,23
TKOFF_PLIM_SEC,2
TKOFF_ROTATE_SPD,0
TKOFF_TDRAG_ELEV,0
TKOFF_TDRAG_SPD1,0
TKOFF_THR_DELAY,0
TKOFF_THR_MAX,100
TKOFF_THR_MINACC,2
TKOFF_THR_MINSPD,0
TKOFF_THR_SLEW,-1
TKOFF_TIMEOUT,0

TECS_PITCH_MAX,15
TECS_PITCH_MIN,0
TECS_PTCH_DAMP,0
TECS_PTCH_FF_K,0
TECS_PTCH_FF_V0,12
TECS_RLL2THR,10
TECS_SINK_MAX,5
TECS_SINK_MIN,2
TECS_SPD_OMEGA,2
TECS_SPDWEIGHT,1
TECS_SYNAIRSPEED,0
TECS_THR_DAMP,0.5
TECS_TIME_CONST,5
TECS_TKOFF_IGAIN,0
TECS_VERT_ACC,7

Thanks

auto
auto1701×887 88.1 KB

2

I would suggest posting the .bin file for a take-off attempt because there may be some other factor causing the issue that one of us may be able to stumble on.

I would turn STALL_PREVENTION on.

TECS_PITCH_MAX will be the ultimate pitch limit for all modes of auto flight, including take-off. So you won’t get to 20+ even if that’s what you’ve set the TKOFF_LVL_PITCH to.

3

I think the problem is Min Speed, now set to 9 ms but launch is too fast than GPS Speed
and not recognize correct speed. i try to reduce to 7 ms and in future maybe need install
Air Speed sensor.

try today another time

4

No after reduce FBWA MIN SPEED from 9 to 7 the autopilot have reduce PWM output
or the throttle… now send only 70% when i make 100% in TKOFF THROTTLE MAX

the Desire pitch remain 5 :-((((