Hi Guy's I had a crash today with my skywalker. It has never battered an eyelid at anything I have thrown at it and has flown many missions without a hiccup. Today I went for a fly at my usual haunt. I uploaded an auto flight with 4 waypoints (I have flown these waypoints before) and hand launched after waiting approximately 5 minutes for the GPS fix. I flew around for a minute or two whilst I positioned the goggles on my head and when they where on I flicked through stabilise to Auto. Once it went into Auto the engine reved up and the skywalker banked slightly to the left (to get on track) and pitched down violently, I tried to pull up but it did not respond at all, I went to Manual mode and by that time it was too late.

I did notice my airspeed went nuts but it was windy around 6 Knts variable. Also the HUD was not reflecting my pitched down angle, Also Ignore the Voltage on the screen, The Voltage has not been calibrated.

I have attached my .tlog, .log amd kmz file for everyone to look at. I have had a look but I can't decipher the logs. Also attached the FPV video as well as the Wing cam.

Another thing I noticed in the kmz file was showing I was flying in yellow stabilise but in actual fact I was in manual which should have been orange. the green in the middle of the yellow and blue reflects me going through Stabilise green to get to Auto black but the kmz shows me going into RTL which is blue. The OSD reflects me going into manual, taking off, flying then going through stabilise to get to auto, I never hit RTL ?

I hope it was something I have done because it was going so well and this was just unexpected.

Any info would be appreciated.

I will upload the Video's as soon as they get to youtube.

Regards

Adrian

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Start with method one. It is easier and method 2 can induce high frequency oscillations that may result in loss of control or damage to your servos.
Method 2 will yield a more stable result and a bit smoother performance in turns, but method one has less risk of accidents and will also get your plane flying nice and responsive.

Look at the parameters for common airframes, I believe the SW is in there too and it will get you started just a little bit faster.

Ah ok. I am now interested. I am looking to use nitro plane in the future. I have only flown electric planes a few times (Actually this is my first Ridgy Didge Electric) I have only ever had Nitro, Turbine or Diesels. One thing that concerns me is the vibration. I intend to build the good old Aeroflyte Hustler MK III. I will cut down the full length ailerons and have 60/40 Aileron flaps. I will probably end up running an OS 46 (I have the 55AX but find it has to manny vibes) The os 46 seems to be smooth. Do the Vibes (if low of course) effect the AMP much ? I was having the thought of either using Zeal tape or using the Range video mount.

Is there any way to monitor the Fuel level in the plane using the APM with the OSD ?

Thank you for the time you put into these forums and Dev Andrew we all appreciate it.

I will do that. You have actually raised a question, Is there a way to tell the APM to run a different frame rate for servos ? i.e., Digital or analogue. 

My condolences for the crash ...

Shortly before switching to auto mode, your battery warning signals again, it may be that you had too little power? Greetings from Germany, Klaus

Hi Klaus, Guten Arbend Vighets ? ( god afternoon how are you I think ) The battery was ok. I did not have the Battery monitor set up correctly. Only recieved a few hundred Mah when charging. Cheers for Chipping in.

I would say its worth a try replacing your elevator servo. I had an HXT 900 on an aileron that would intermittently fail to full deflection. It caused two crashes with me thinking it was a brownout. 

Hello Adrian, 

     I figured Id chime in here as I had the exact same problem on the exact same airframe. I too was flying a skywalker 1900 and had many great flights until one day, when I switched from FBW-A to Auto, and the motor reved up and nose dived into the ground. After that, I was fortunate enough to have Andrew Tridgell, whom has already posted on here, take the time to walk me through my log files. What we found is that there was a massive amount of magnetic interference with the APM board from the ESC. If you pull your logs and look at the "mag_field", this graph should be linear. Mine was jumpy as all get out. My solution was to move some things around in the airplane to create more space between components as well as shielding what I could. Hopefully this isn't your problem, but it is definitely worth checking.

Hi Ted, Ron here I fly with Adrian and he uses only the best of parts to build his models. He had some wiz bang expensive servos in his model while I use the cheaper emax stuff however even the best components can fail at times. In this hobby if it can happen it will happen.

If you use digital servos they should go floppy if they fail and you might still get home in time for tea and medals.

Hi Ron,

If you are using the stock clamps for the SkyWalker 1900 for you elevator/aileron control rods then it might be worth looking at replacing those. I had a lot of trouble with the little grub screw on those slipping on the smooth wire during flight, with nasty results.

I found that putting a bit of CA on the wire and letting it dry then sanding it rough helped with the grip of the screw, but it still isn't ideal. Hot glue to hold it in place might be a better idea.

Cheers, Tridge

Agreed, if it can fail it will eventually in this hobby. In these foamie planes we generally hard mount our servos making them very susceptible to vibration. Even an expensive servo can fail in a high vibration environment. It is worth balancing props for this reason alone. There is a reason most servos come with rubber grommets.

I'm not saying you didn't balance your prop or even that your servo failed, just a general comment about the fact that we hard mount frequently and this puts a higher stress on our servos.

Hi Ted. I am using Hitec HS-65 Karbonite servos. I did replace the servo on the ground but was getting the same results. If you where getting brownouts how where you powering your system ?

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