with lots of new snow, I decided to test recovery time needed to stop the fall if motors stopped during the flight.
I did it the way I see this accident to happend. - while in loiter, I took the throttle stick all the way down, for descend - then - switched to stabilize.
Motors stopped, I pushed the throttle up, - apparently 8 meters was not enought to stabilize, and it hit some bushes. The test was a success.
What to learn from this ? - it should be impossible to stop motors in flight ? -a minimum RPM should be maintained from the point of arming, to disarming ?
I accidentally shut off my motors in flights doing exactly what you described. I immediately showed the throttle up full and no harm was done (it was pretty high at the time).
Video of the flight (around 4:03 for motor shutoff):
Set #define CUT_MOTORS 1 in your apm_config.h file and your motors will always run at min_throttle when armed.
MK copters do that... stick all the way down... motors still spinning at very low rpms till disarm
I do not think I would fly APM if you couldn't turn off the motors. I always want the ability to ditch if I so choose. I have ditched my Raptor 50 before when I lost my tail servo and had an un controlable pyro. It was heading towards stock animals and there was no time to auto. Its just a matter of safety. Perhaps you should have performed your test at 30m+, that would have given you a fair chance for recovery.