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AC 3.1.1 crash need help in analysis

Posted by Thomas Kranz on February 17, 2014 at 7:02am

Hi all,

i had a crash today with my quad with the following components:

3dr APM 2.5 + 3dr GPS with external MAG + 433mhz telemtrie

Futaba R617S

4 x Rctimer HP4108-480 KV with rctimer 40A opto ESC

BEC standalone.

90A voltage and current sensor

while doing some agressiv yaw tests the copter flipped (i did stop the yaw input)

log is attached i will upload the video in a few minutes,

Thanks

Thomas

2014-02-17 14-28.log

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Replies

  • Andre K. February 17, 2014 at 11:09am

    Yep, your ThrOut go very far down - this reminds me of aomething I reported while doing badass testing, I even predicted a crash :)

    Unless your motors have a pretty high idle speed set, one or more probaply stalled when APM commanded the low throttle:

    https://github.com/diydrones/ardupilot/issues/836

    • Thomas Kranz > Andre K. February 17, 2014 at 11:37pm

      Thanks Andre,

      any way to prevent this ? i'm flying 15 x 5,5 props@5S very  efficient setup :-)

      maybe higher ThrMin ?

      thanks

      Thomas

      • Andre K. > Thomas Kranz February 17, 2014 at 11:47pm

        yes, higher minimum throttle/idle throttle will fix it - do plenty testing on ground .

  • Thomas Kranz February 17, 2014 at 7:27am

    http://youtu.be/CBYAfuONFK8

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