Hi, I recently had my maiden flight with a Bixler 2, which actually resulted in a crash (fortunately not too severe... )
My Bixler is fitted with a nice APM2, arduplane 2.61 with Bixler default params loaded, airspeed sensor, and a very lightweight 1.8A battery in the nose of the beast. The nice bixler flaps have also been configured on channel 5 as Auto Flaps.
After a manual launch, I realised I had 2 channels inverted (Rudder and Aileron I think), which I though I had checked of course, but apparently not. That was quickly fixed at the 9x level.
Second manual launch, I quickly shifted to Stabilize mode, which was ok, although the plane showed a small tendency to go down and right. After checking on the ground that my control surfaces were in fact ok, I decided to manually apply a bit of flaps... probably a strange way to correct the plane up/down behavior but I read that a bit of flap makes the plane go up... Which seemed to work ok for nose diving, although still the same for going right very slightly..
Anyway, given all these parameters, I still decided to test RTL, which ended up in a big turn on the right, and a quick dive... fortunately I could quickly switch back to stabilize and recover.
My crash was just after an ultimate launch, mistakenly launching the plane in RTL mode, which obviously didn't go very far in the current situation :-\
Anyway, few interrogations here:
- is there a specific APM parameter I should preferably look at in order to fix the nose diving when in RTL
- is there a possibility that the flaps config be reverse at the APM level ? I have also assigned flaps on a channel of my 9x (Pit Trim), and i can only say that turning the button right will make the flaps go down, left up.
I have to say that I didn't measure exactly the final COG of my bixler, which seemed approx in the right spot; I didn't worry too much about that aspect because I have very little equipement in the plane, and a light battery... so I assumed that wasn't the reason why I would be nose heavy during flight.
Thanks in advance for any expert advice on that. Let me know if the log file could potentially help, although I noticed through looking at the KML that it only shows a very small portion of the flight... (maybe only the last launch..)