On Saturday I launched my hexacopter another time. Things went as usual, while I was at STABILIZE mode and ACRO. When I had switched to ALT_HOLD the hexa suddenly stopped and fell down like a rock. I switched back to ACRO quickly and tried to catch it in the air. I had only partial success. My hexa crashed hard and frame was damaged.
I don't like such sudden crash with no visible cause. So what has happened? Here is the log, but I am not so skilled to find out the reason. Would anybody be kind to take a look?
May be the the reason is that I don't use neither separate BEC, nor power module but one of the ESC's internal one. The battery was not exhausted.
Replies
I have been compiling several DIYD discussions regarding ALT_HOLD.
When you switched, the Throttle Out dropped to 130 which is probably near, or below minimum throttle. The 'fix' is to adjust variables relating to ALT_HOLD.
Mind you, I have not tried this mode yet.
The variables, PID (commonly called) are discussed HERE.
I am on a different PC now but will later try to post the discussions I found regarding ALT_HOLD.
You are not the first person to experience this.
-=Doug
The
The tlog would provide a 'playback' mode if you can upload it.
How many flights (battery cycles) have you had on this aircraft before going to ALT_HOLD?
The log states your battery monitoring is disabled:(you have APM 2 -- I added my AttoPilot sensor later)
When you switched to ALT_HOLD, the (now) obvious level of throttle out (from the APM) almost tanked:
Still looking over your log...
-=Doug