I am new to APM and just started to enjoy it…I habe the 2.5 version with airspeed sensor…generally it flies really well in
- MAnual
- Stabilize
- FBWA
And all of them work nicely. FBWA has a bit of too slow gaining height, goes up very slowly, but is a pretty Relaxing mode, Need to narrow it a bit more towards stabiize for my taste, but it makes sense.
The second group with the Auto-functions nevertheless were trouble maker:
- Cruise
- Loiter
- RTL
On cruise, it immediately started to accelerate and descend drastically. From a mode were altitude hold should be the priority, I would nevere xpected this. Or is target speed the priority no matter of altitude ?
I would have expected something like a Change in throttle as the throttle stick is no longer a throttle stick, but an air Speed stick (I have the air Speed sensor active). But I have NO IDEA why the plane lost height so quickly (or at all, all of these modes should maintain the height)and accelerated at the same time. If I accelerate in stabilize it would not loose height, so has nothing to do with prop- forces.
On Loiter, it did the same: became faster and faster and lost height…
…so after max 5 sec I needed to Switch back to the first three modes or I would have crashed the plane.
It was a windy day today, but that cant be the explaination. I used the Skywalker Profile from the ardupilot Webpage, but not went through the Tuning process of all PIDs myself (yet).
I have no clue yet what was going on…your help is highly appreciated.