After a couple of successful autonomous BIXLER flights, I felt I could securely move to the bigger Skywalker, which had it's maiden flight yesterday: APM2, Arduplane 2.66, Skywalker default param, 3DR UBLOX, no airspeed installed though.
Since I realized through some former reading that the calibration of the APM on the field is quite important, I used a bubble level placed on the flat area at the back of the prop (as soon after I puggled the battery)
I then tried flying in manual... perfect! not much trimming needed.
Then move to stabilize...perfect! the plane returns to level and straight flight asa you release the stick. Wow, I'm staring to get very excited... the default APM parameters loaded for this plane (http://code.google.com/p/ardupilot-mega/wiki/ConfigFiles) are great and it really stabilize perfectly well.
I then decide to test Fly By Wire A (since no air-speed installed). And that's when I got into trouble. No more throttle!.... stick down, stick up, nada.... reverting back to stabilize... still no more throttle!...even more surprising, reverting back to manual didn't restore the throttle.........?????
Fortunately the plane was high enough and not too far away, and I was able, not without stalling once, to get it (kind of) back in one piece - a bit of a hard landing on the nose but just a couple of small cracks...
- Does anyone have an idea of what is possibly going on here ? it seems strange to me that the throttle isn't coming back when switching to manual, thus supposedly bypassing the APM... maybe someone else would have come across the same issue ? could it be a problem with some of the APM parameters ? (I doubt).. any clue on this issue would be welcome!
- what are the meaning of the UBLOX GPS lights ? I get one solid red, then quite quickly an additional blinking blue one... I was used to the solid blue from the MTEK, but is it different for the UBLOX ? Also, can someone confirm that in the proper way the UBLOX should be setup, the led are then sitting under ? (unlike the mtek)
Thanks for any help
PS: can share any tlog file unfortunately - it seems none have been recorded for this specific flight :-\