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the danger of stopping motors mid-air - tested, now what ?

Posted by Andre K. on November 10, 2012 at 3:45am

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 ?

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Replies

  • Christopher Cooper November 14, 2012 at 6:22pm

    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):

  • 100KM
    u4eake November 10, 2012 at 10:05am

    Set #define CUT_MOTORS 1 in your apm_config.h file and your motors will always run at min_throttle when armed.

  • Eddie Weeks November 10, 2012 at 6:33am

    MK copters do that... stick all the way down... motors still spinning at very low rpms till disarm

  • James Roney November 10, 2012 at 5:29am

    Hey Andke,

     

    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.

     

    Regards,

    Solo.

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