Replies to This Discussion

Permalink Reply by Mounir Zoorob on April 14, 2012 at 3:23pm

i have the same problem :( and it is very bad.
my ESC connections are all soldered and everything is setup right.

note that my OCTO is flying very very good. i had on it more than 170 minutes of flight time, until it decided to snap the first time on me "log file 65" i took it back home checked everything did a couple of flights and everything was "OK" until today i took it to the field did the first flight everything was smoooth and perfect, second flight new battery and everything on take off it snaps on me again it broke one engine mount since it landed on its back !! "log file 75" i have an on board video for the crash if anyone would like to see
if someone can analyze the data and let me know what my problem is that would be great.
thank you in advance,

Attachments:

• crash.rar, 22 KB

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Permalink Reply by Brad Smith on April 14, 2012 at 10:38pm

One thing ,it looked like you moved it during initializing and the crash seemed to happen about the time it takes mine to get a GPS lock . dont know if this may cause problems 

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Permalink Reply by Mounir Zoorob on April 14, 2012 at 11:02pm

i never move it when its initially on and i always make sure i have my GPS lock before flying. for RTL to work properly.
i checked the video again and it was stationary not moved or anything.
problem is coming from another place for sure

thanks Brad Smith

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Permalink Reply by Alpo Hassinen on April 14, 2012 at 11:55pm

Same also here. I fly couple of days ago. First flights were ok, as good as can be. Then in one flight copter suddenly without any warning flip to right and hit to ground. Fortunately we have here half a meter show, so no damages (except that everything was full of snow.)

I have jDrones hexa with those bigger motors, escs and props. Arducopter was version 2.5.3

It seems that there are several other cases in forum, for example http://diydrones.com/forum/topics/octo-copter-flips-right-after-tak...

Attachments:

• 2012-04-13 10-48 7.log, 273 KB

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Permalink Reply by Mounir Zoorob on April 15, 2012 at 3:22am

the post you are pointing to is mine :), i created it so that we can all share there as a main topic too.
also mine when it flipped it flipped to the right too. i find that really odd that all three cases are the same !!!!!

hope someone can help with this issue.

and if you solve it share with us your story too . please

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Permalink Reply by heikki.tukiainen on April 15, 2012 at 3:59am

Is the direction of the flip always the same? In video it was motor / esc number 4 (back left) that failed.

Please try to reproduce the situation on hand held flight. Just hold the quad firmly and push it. If the issue reproduces, you are closer to a resolution.

You can also swap motors / esc to find the root cause.

(I had a similar situation and lost >10 props because motor number 4 was faulty. By chaning the motor to anoter position I was able to find out that it was a faulty motor. I replaced the motor and all worked then fine. Other areas i tested were 1) esc trottle calibration 2) esc low voltage detection 3) power outages / viring 4) faulty esc)

I hope this helps.

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Permalink Reply by Craig Burden on April 15, 2012 at 8:04am

The problem is that mine has not been flipping in the same direction everytime...

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Permalink Reply by Brad Smith on April 15, 2012 at 7:18am

one other way of checking would be too disconnect esc's and replace with servos with a long arms and you should be able to see what going on

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Permalink Reply by Craig Burden on April 24, 2012 at 11:40am

BUMP!!

Please help guys, I can't fly until I solve this! I keep on breaking props and I want this to stop so that I can fly in peace 

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Permalink Reply by Brad Smith on April 28, 2012 at 5:59am

no more reports of crashes ? so its probably a esc motor or bad battery connection problem . i have also noticed that most of you quad guys  don't twist your servo (esc) leads ? this on my plane and heli would cause servo jitter and when i was messing with robotics they all twist there leads just strap it down and test test test and also if your transmitter fail-safes are wrong this would cause a problem ,,,good luck

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Permalink Reply by Craig Burden on May 2, 2012 at 9:24am

I haven't flown since this last crash, no one has given me any help at all... I would agree with the possibility of the jitter coming from the untwisted cables but that does not explain the fact that I lost control when it started to flip. Thanks for the idea, I will give it a go and feed back.

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Permalink Reply by Brad Smith on May 3, 2012 at 5:16am

do you have a BEC because most esc's don't have enough power for the APM and a bad battery will drop the voltage to low and cause a reset ,and vibrations from unbalanced motors or props .if you don't have telemetry loosely strap it down and use the usb to check for low voltage, vibration,   

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