I need advice on how to help a motor glider to:
Here is a log showing its current behavior
My idea is to set TECS_OPTIONS to AllowDescentSpeedup and decrease TECS_SINK_MAX and AIRSPEED_MAX, which are currently the default values and are for sure too high
Is there anything else or a better way to do this?
What do you mean by that? It appears to be doing descent to the floor and climb back to altitude while in auto which is the expected behaviour if it didn’t catch any thermals.
Drop flaps as much as possible to increase drag, have airbrakes or reverse thrust.
On our MPX Lentus (3m motor glider) I have configured auto flaps to fully deploy for approach, still the plane can’t approach steeper than ~3.5° or it will not be able to maintain target airspeed, with ~3° being preferable for more stabilized approaches. 6° is way too much for a glider without airbrakes.
At 22:35 SOAR_ALT_MAX is reached (250 m); the glider exits thermal mode, returns to AUTO mode, and attempts to reach its next waypoint, which is at an altitude of 190 m. It is still caught in a thermal updraft and continues to climb (up to 360m) because I think it is locked onto SOAR_CRSE_ARSPD (= AIRSPEED_CRUISE for me) and cannot pitch down without risking exceeding AIRSPEED_CRUISE. The same for next waypoint
From what I understand, the LAND_FLAP_PERCNT parameter is used only during the landing approach and flare, and not during the loiter-to-alt phase.
My Glider is not so far from yours https://www.air-rc.com/assets/pdf/ASW-28_3653.pdf