Mikrokopter Several crashes, some lessons learned

[ovdt]

Hello guys,

I've been out for filming and photo shooting, I couldn't have enough time to participate here.

Crash with YAW gyro malfunction:

I barely call it a crash. The yaw gyro stopped working in flight. It started to spin like crazy. I had hard time to control it but managed to land it with minor damages. Only one prop was broken. I've sent the board back to MK fro yaw gyro replacement.

Lessons learned: Never trust electronics even your last flight was absolutely fantastic.


Filming in -25 celcius:

Keeping Lipos warm was a problem. Half of my Lipo's had low voltage due to the cold. The screen of the transmitter was frozen so I couldn't read any telemetry. Don't ask my fingers!

Walking in the snows and orientation on a steep mountain was a problem. I'll post the video footage soon.

Lessons learned: Get a hand warmer and put the Lipos in that bag with the warmer.


Crash at the second day in -25 celcius: While flying, the copter suddenly cut the power off. It falled into the snow. No damages. The other day we got back to the city and we had another filming. Pre test flights were successful. So we flew our craft again.

After 3 minutes, the power was cut again. From 50 meters.

View attachment 2395

Well, I haven't figured out the reason. Because I forgot to install the SD-card to the navi-ctrl! I have to the some testing but the electronics seems to work. Except 5 motors (that's a X8) and electronics, everything is a mess including AV200 camera mount.

So lessons learned: If the craft cuts the power off without a reason, do a wise study. Flying it for another 10 minutes shouldn't be enough for trusting it again. Another thing is, always record the flight data to the SD Card.

The funeral of Y6

I have several crafts. One of them is X8, and you can see its funeral above. The other one is Y6. One of my favourite. While taking some videos with Y6, I've lost the RC signal. ( I was flying waypoints and a building was blocking it). Thanks to me, I forgot to adjust the failsafe settings and it did an emergency landing instead of coming home. Two of my motors (Axi 2814/22) got severe damage (Emergency gas was not correct either).

Lessons learned: Adjust "come home on rc signal lost" feature correctly. And change the coming home altitude every time you fly at different places.

The video we had with Y6:

I hope these will be the last horror stories you'll hear from me.

 

[Jake Bullit]

"I hope these will be the last horror stories you'll hear from me."

I do to,but I doubt it:black_eyed:

It could have been worse ,I always say.At least you didn`t come down in the Bosphorus

Nice filming btw,looks nice down there.Look forward to see your videos in the mountains

 

[ovdt]

Jake, actually one of my quads crashed into the Bosphorus back in November. I had to dive by myself in a such cold weather without blinking my eyes. The story is again pitty:

We decided to film nice places among Bosphorus and we ended up to take a panorama. I ascended to 20 meters and turned on PH and the bumm. In a matter of seconds, it was in the water. The problem was with the pressure sensor. The legs were broken. The flight Ctrl died before doing its 30th minute flight. MK RMA service said this would be impossible to fix because of the corresion.

Lessons learned: First try PH on a safe spot. Always check the legs of the pressure sensor before / after every flight session. New hardware doesn't necesseraly mean bullet-proof flight.

 

[ovdt]

BTW, only Navi Ctrl and GPS survived the bosphorus holocaust. Nex5, Lipo, Flight Ctrl, Video Tx, Spektrum satellites are all long gone. My wallet seems reliefed

 

[BorisS]

That Av 200 looks like it was originally mine am i right and did i recognize it ? Sorry to hear about all the crashes ?

Boris

 

[ovdt]

Yes that was your AV200 Boris, I bought a repair kit and it's working fantastically right now.

After the X8's free fall crash, I no longer rely on molex cable between FC and PDB. I solder C&D lines and +/- lines directly between FC and PDB. After that power cut problem, I flew the X8 several times and there is no problem now.