Model:
flying wing with stall speed at 11m/s and cruising speed for mission flight of 13m/s
Airspeed instaled and frame has some flight hours
Board APM 2.5
TECS_LAND_ARSPD: 12
MIN_GNDSPD: 900
TECS_LAND_SPDWEIGHT: 0,82
WP#3 is last waypoint before WP#4 that is LAND at 0m height.
Land mission sequence is loaded aroun 97% or Tlog.
Issue:
Arround 98.25% of tlog wP#3 is crossed while flying at 13m/s and at that time you can see that nav_pitch sends command to increase a lot of pitch causing the model to loose airspeed below stall speed and for that droping wing and falling.
Questions:
Is this a thing that can be improved in future code or are there parameters that can smooth this transition to LAND mode avoiding the climb and loosing flight speed?
How can I straighten the flight lines avoiding the snaking?
when you say stall speed… do you mean your FBW min speed ? if you do, thats not stall, thats the minimum speed that you can fly while banking and pitch at the angles that you have set and not close to a stall
my fbw min is 13m/s
the model has a limit of 9 to 10m/s to enter stall and fall from sky
GOOD NEWS from v3.3.0!!
Numerous Landing Changes
Once again there have been a lot of improvements to the automatic landing support. Perhaps most important is the introduction of a smooth transition from landing approach to the flare, which reduces the tendency to pitch up too much on flare.
There is also a new parameter TECS_LAND_PMAX which controls the maximum pitch during landing. This defaults to 10 degrees, but for many aircraft a smaller value may be appropriate. Reduce it to 5 degrees if you find you still get too much pitch up during the flare.