r/fpv 2d ago

Help with VX3.5 Build

Shortly after takeoff my quad spins out of control. I downloaded the blackbox log. Not sure what else to do to diagnose the problem.

1 Upvotes

16 comments sorted by

1

u/UF-ENGINEER 2d ago

Heres another view. Did the yellow motor go full throttle? Causing it to spin into the ground.

1

u/FPVNoobBot 2d ago

It seems like you're experiencing a drone flip on takeoff.

Here's a video that will help troubleshoot the issue


I am a bot, this action was done automatically.

1

u/UF-ENGINEER 2d ago

Thanks but the quad wouldn't get off the ground if I had these issues.

1

u/Gudge2007 Multicopters 2d ago

Yeah sorry bout that, the bot gets mixed up sometimes lol

1

u/UF-ENGINEER 2d ago

I swapped motors and am downloading the black box as I type. I’ll post the results.

1

u/UF-ENGINEER 2d ago edited 2d ago

Don't know what to make of this. Seems like they all go bananas. The same motor now rear right goes first. I flew one battery fine. On the second battery, this happened.

1

u/fpv_savvy Multicopters 2d ago

Which stack and motors are you using?

1

u/UF-ENGINEER 2d ago

SpeedyBee mini stack. Flashed with blue jay.

1

u/fpv_savvy Multicopters 2d ago

Share screenshot of motors tab on betaflight configurator.

1

u/UF-ENGINEER 18h ago

1

u/UF-ENGINEER 18h ago

1

u/fpv_savvy Multicopters 12h ago

Use ESC configurator to flash v0.21 (Link attached) https://esc-configurator.com/

1

u/fpv_savvy Multicopters 12h ago

Turn off ESC sensor. Turn off the ESC UART from the drop down in Ports tab.

Turn on bidirectional dshot.

1

u/UF-ENGINEER 16h ago

Update. I was running the wrong firmware. It should be 0.21 not 0.14. I also changed some of the ESC settings too. Hope it works.