Super Sky Surfer Crash Analysis

Posted by Serge Gonzales on September 21, 2013 at 8:30am

Hi guys,

I need help analyzing my logs and need to confirm if the crash in auto mode was caused by an elevator servo problem or an airspeed problem. This was flown in a remote region far from people and property.

5 minutes into the flight, the aircraft went into full power, nosed down and flipped over due to excessive airspeed. Below is a video of moment things started going wrong. 

https://www.youtube.com/watch?v=KDiQxZ21Zzc&feature=youtu.be

I also attached the .log file

Regards,

Serge G.

2013-09-21 21-08 81.log

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Replies

  • iskess September 21, 2013 at 6:06pm
    I had a situation where my copilot clicked Preflight_Calibration while in auto flight, which resulted in a zero airspeed. The plane pitched down and went full throttle, but it wasn't going to exceeds any parameter limits and cause a crash. My understanding is that the new TECS controller is much better at handling a failed airspeed situation than previously. I'm surprised it pushed you nose down so far beyond the pitch min limit.
    You can see my failure at 4:00 in the video here:http://www.diydrones.com/forum/topics/strange-happenings-on-waypoin...
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