Flying in gusty conditions, my OSD seemed to freeze and I hit RTH (thinking it was just the OSD feed) - It was not! the FC gyro seemed to be stuck on a 90 degree angle.
I lost video feed just as I entered the trees and a good dose of throttle and blind luck pulled me out in time!
A VERY lucky escape and lesson learned.
That was close! Well done!
Cheers!
It was a bit of a wake-up! I landed and reset everything and the next flight was faultless.
This is what I was flying:
Do you know what caused the fc to lock up?
I don’t, I might re-flash the firmware just to be safe.
Out of curiosity what radio system and flight controller were you using?
Nidge.
@Nidge I use the Lefeirc SN-Navi FC and a modified Flysky FS-i6 running a Frsky R9M module tx and R9MM rx.
Fantastic setup which is usually flawless.
Glad it ended well 
- even if there was an increase in the laundry bill 
Thanks for the info, Matty.
Assuming you initiated the right hand roll I’m thinking of two possible causes.
You experienced a momentary servo stall.
You experienced a momentary failsafe.
I’ve yet to have a play with an iNav system but I understand it shares many similarities to the Pixhawk/APM/Cube. If it has a similar logging capability to these systems any issues should be recorded, including loss of signal or a drop in the 5Volt supply caused by a stalled servo, which could also result in a brownout and cause a failsafe trigger.
Nidge.
I’ve always preferred a separate battery and BEC for the RX and servos, a bit inconvenient but saves the day in the end.
Hi Nidge,
It was me that hit the RTH switch as a test to see if the FC responded as the OSD display was frozen.
What I didn’t allow for was the FC had frozen thinking it was banked over so when I hit RTH it banked over twice as far and went into the death plummet. I had perfect RSSI the whole time though which how I punched out. I think the loss of video is because I was using a high gain helical on my monitor and it just lost signal below the tree line.
My next project is to get the Mavlink telemetry through the S-Port on the R9M so I can ditch the bulky 3DR tx.
I’m also awaiting some 18650’s to make a 3S 6,000Mah pack for longer flights.
Great bit of flying. Well done on saving that .
