"Hi Pedro,
Since getting it back from Maxbotix, it's never really worked.  It seems to give good readings statically, but when flying, it won't work properly despite efforts with electrical noise and vibration reduction.  Now, whether that's the…"

"Live: Balwyn
Fly: Gladysdale (near Powelltown)"

"On some motors, the shaft sticks out the bottom by a mm or so.  Check that it's not binding on the motor mount."

"Not being an expert log analyser myself, I can't help from that side. 
However, from the symptoms, it sounds like you might be intermittently losing a motor.  Front flip suggests it's perhaps the front motor.  One of the common causes of this is a…"

"You could connect this to channel 8 of your receiver:
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=...
Use it to switch off the +5V to the APM.  That'll kill it!"

"The sonar is very sensitive.  Mine reacts to a wire fence from 2m above.  You need to be sure the field of view of the sonar is completely clear of anything, including wires.
There's also a possible bug in the sensor that causes it to stop working…"

"Is there documentation yet for the LED code built into the latest releases?  If so, can someone point me to it?
I've searched high and low and can't find anything much that makes sense."

"Delayed answer but ... yes, we can use the 915 - 928 MHz ISM band with certain power limits, but without any special license. 
The 3DR radios have configuration settings to make them legal in Aus: http://code.google.com/p/ardupilot-mega/wiki/3DRadio"

"Instead of reversing on the APM, set the Throttle to reversed on your transmitter."

"Try wiring the LED with red to +5V and black to AN7.  When the output goes low, the LED will go on."

"This might explain it: http://code.google.com/p/arducopter/issues/detail?id=430"

"There are several possibilities for Failsafe.
Depending on your Radio, it may have Failsafe built into the Receiver.  Typically, you set the Transmitter controls to the required Failsafe settings (e.g. Throttle down), then you re-bind the Receiver…"

"Probably just a bad connection between motor and ESC causing the jittering. 
However, it seemed to fly OK when you had it in the air for that 4 second period ... until an arm came off.
Seems to me your main problem is the unglued PVC joints. …"

"I tried Alt Hold at about 30 cm yesterday over a flat surface (tennis court).  Each time, the quad was unstable and would slowly rise to ~ 75 cm before stabilising.
I haven't looked at the logs yet.  However, there is a large amount of prop wash…"

"It's important to adjust the weightings of the inputs in the correct order, as some of them interact.  I followed this guide: http://diydrones.com/profiles/blogs/mode-switch-setup-for-turnigy
Mission Planner in the Radio Setup window will tell you…"