Autoland flare behaviour

I’ve been testing out Arduplane 4.7 dev for a few weeks on a trainer type high wing balsa model (Seagull Boomerang). Take offs, waypoint following and landings have been successful mostly but I can’t seem to get the plane to flare before touchdown…any suggestions would be very welcome. I have tried changing relevant FLARE, TECS etc parameters but changes have made no discernible difference…Plane has a TF-02 Benewake rangefinder and a digital airspeed sensor, FC is Pixhawk 6C with Holybro external GPS, compass unit.

Links to a bin file and FPV movie of the most recent flight:

bin file

fpv movie

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Its trying, just the pitch tune is a little loose.

Thanks - would a focus on pitch during an extended in-flight autotune potentially help? I probably tend to focus on roll and yaw when autotuning. Or should I manually alter some parameter values to tighten pitch tune?

You certainly could try a autotune, it might do a better job. If not you can always do a bit more manually.

Did 3 long’ish autotune flights today….parameter changes only on the first flight though

I think the graph indicates improvement…?

MAV> paramchange

MAV> 2026-03-15 07:38:12.680 PTCH2SRV_TCONST 0.500000 → 0.750000

2026-03-15 07:38:12.680 PTCH_RATE_FF 0.405645 → 0.547652

2026-03-15 07:38:12.681 PTCH_RATE_P 0.163027 → 0.137657

2026-03-15 07:38:12.681 PTCH_RATE_I 0.405645 → 0.547652

2026-03-15 07:38:12.681 PTCH_RATE_D 0.009732 → 0.006252

2026-03-15 07:40:43.580 BARO1_GND_PRESS 102579.054688 → 102580.601562

2026-03-15 07:40:54.581 BARO1_GND_PRESS 102580.601562 → 102581.226562

I’d be very grateful for some assistance with my autoland endeavours. I’ve managed to tune my system to the point of successive good quality landings with only small deviation from planned profile. One problem is left which I cant pin down, the flare height is not consistent enough for my very short field, any long landing means almost certain damage when it hits trees. I relatively successfully used manually controlled lift spoilers to arrest any overshoot during the flare, but I would prefer to use reverse thrust. As there isn’t parameters to allow manual throttle during this flight stage could anyone point me in the right direction within the latest plane code so I can make the required modification to allow throttle pass though during flare? Any help will be appreciated.

Are you using a rangefinder?

In my experience always arming on the ground helps with landing consistency. Having consistent approach path angle helps too.

During flare the mottor is supposed to stop, you coul configure preflare with lower speed and use reverse thrust during that phase to lower your touchdown speed while maintaining safe approach speed.

Airbrakes may be relevant Airbrakes — Plane documentation for your use case.

IMHO having support for (ground) spoilers would be neat.