V4 crash while at Flite Fest

[Rotorblade]

https://www.youtube.com/watch?v=gFsyvPXkxSI
My precious stock V4 tricopter fell out of the sky. It’s like it disarmed mid air. I have no idea what happened. I have 2 and a half hours of flight time on the copter, same props I started with, no crashes at all up till this point. Any guesses as to what caused it? Think it might have been a reciever/failsafe glitch?

Nothing broke on it except the zip ties holding the landing gear on. A bean plant appears to have broken the fall. I immediately went back to my table in the build tent, took the props off, checked the voltage, thing powers on and arms. Nothing seems wrong with it. I got lucky with the crash I guess. I even had the chance to show David that there was no broken parts from the crash.

I had 3 previous flights like this with no issues. I’d go up and fly around for 4 minutes and come back. I kept the flights pretty conservative while line of sight while around so many planes.

I might add that the previous flight to this David tested this copter and the copter didn’t show any signs of issues. Maybe the triple flip jarred something loose in it, I don’t know. https://www.youtube.com/watch?v=4DeToQ5ncnA Proof it was flying good previously.

David if you’re reading if you recall I came up to you shortly after you flew this saying how it fell out of the sky and it miraculously survived physically.

I’ll post some pics of the copter itself, but it’s a bone stock V4 tricopter running sbus to a x4rsb-2.

[hertz]

Have you set up Fail Safe according to CleanFlight’s documentation? Are you using ARM switch? Do you have a buzzer connected and feature enabled? That definitely looks like disarm, especially if you use a switch and not a stick combination, but I don’t here any buzzer sequence.

My two cents: get yourself a MW-OSD, that way you will see current throttle position, flight mode and other useful indicators. An OpenLog device connected to UART may also be of tremendous help to debug such problems, that way you’ll see RX and FC outputs.

[swissfreek]

At FliteFest? I’d bet a lot of money it was a failsafe due to RF interference. TheRe was crazy interference out there.

[hertz]

Haven’t thought about it initially. Have you set the fail-safe on your Rx? FrSky for instance has a default fail-safe behaviour that will do a similar thing, and FC won’t even know that fail-safe condition was triggered, hence no appropriate beep sequence. If you have FrSky, set fail-safe to no pulses and revisit your fail-safe settings in FC Configurator just in case.

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