Failsafe and Circle

Archive
1

Can anyone tell me is it possible during fail safe to have the APM go direct to RETL and not use the Circle first?

TIA Hally

2

Setting the failsafe times really short works, I have 1.5 for short and 3 for long but you could go shorter.

3

Mark again thanks for your reply I have found the params that need to be changed as here:-

FS_LONG_ACTN,0
FS_LONG_TIMEOUT,20
FS_SHORT_ACTN,0
FS_SHORT_TIMEOUT,1.5

I have to admit to being confused about the difference between the long and the short failsafe ?

At the moment what is happening is that at signal loss it goes to Circle for 20 seconds and then RETL. I would simply prefer it to go direct to RETL without CIRCLE.

Hally

4

Ok those lines now read:-

FS_LONG_ACTN,0
FS_LONG_TIMEOUT,2
FS_SHORT_ACTN,0
FS_SHORT_TIMEOUT,1.5

This takes it to RETL really quickly with no 20 second wait for it to get into any sort of trouble :smiley:

Hally

5

Glad you sorted it.

Just for reference, the fs_short_actn (continue/circle/glide) is activated when a failsafe (throttle/gcs) is activated for the fs_short_timeout time.
The fs_long_actn (continue/rtl/glide) is activated if that same failsafe is maintained for the fs_long_timeout.

I’ve always interpreted it as if you lose radio contact the plane goes into throttle failsafe, if it stays in fs for 1.5sec the plane starts circling in an attempt/hope of regaining that radio signal. If it doesn’t regain it after 20sec the plane comes home.