Hi all,

I've just built a brand new 3 inch sub250 build and I'm having some issues with getting it off the ground. The main issue is when taking off motors 2 and 3 are not throttling up like you'd expect from viewing the blackbox log, which then causes a runaway and the quad disarms itself.

I've checked my props countless times, motor direction in Betaflight, motor direction on my esc and they all seem correct.

The quad can be controlled on each axis at no throttle before trying to take off.

I'm running Beatflight 4.4.2 and hardware wise I've got the speedybee f7 v2 mini stack with the 35a blh_s esc flashed to bluejay. 4x tmotor 1404 at 2900kv on 4s lihv 650mah. Due to space limitations I had to mount the stack 180 degrees however I have corrected this in betaflight and the 3d model matches exactly what the quad is doing.

Here's a video of the issue for show:

https://youtube.com/shorts/UfJvhhK2Rjw?s...qdc8t2fTEV

This problem has really stumped me so any help you might be able to give would be greatly appreciated.

Many thanks,

Pricey

Looks like you are running props out, some things to check:
- the MOTORS DIRECTION IS REVERSED option is enabled
- the board orientation is correct as confirmed with BF configurator 3D model
- the motors are mapped in the correct order 1-4

You Sir are a legend!
I had completely forgotten to reverse the motor direction in betaflight. Complete noob error that I don't think I'll make again now ?.
Thank you for pointing it out.

Glad you got it resolved. Once in a while I still forget to set those same settings so that hop and spin is familiar.