VTOL airraft went in to spin mode after 5 seconds of transition

[Hari_prasad_jain]

Hello Guys,
I have attached a log file for my vtol flight which took place on 4th July, 2019.
Plane took off in vtol mode to a height of 15 metres and was made to follow the waypoints in auto mode, after 5 seconds of transition aircraft was seen to be banking towards left but aircraft started spinning in clockwise direction viewed from top.

Kindly help me in finding the reason behind it.

Crash log

[Hari_prasad_jain]

Crash log : https://www.dropbox.com/s/z8q843bmi62g8iu/2019-06-04%2018-44-54.bin?dl=0

[Evan110011 (Evan Williams)]

What sort of airframe are you running?

e.g. an X-Quad configuration with front tilt motors?

I want to see if your case might be related to another couple reports:

QuadPlane（ 2 front motor tilt）transition yaw swing

Hello everyone，I build a quadplane which has 4 motor and two front motor can tilt.I follow the quadplane document to setup my aircraft. Now my quadplane work fine in QSTABLIZE and FBWA,but it cause yaw swing when I switch QSTABLIZE to FBWA. I try to open VectoredYaw,but the problem still exist.This problem is bothering me for a long time.Hope someone can help me solve this problem. https://youtu.be/zK03TTM7YKI here is my param quadplane.param (20.6 KB)

[Hari_prasad_jain]

Hello Mr. Evans,
Thanks for your reply.

I have designed a glider and the motors were placed in X configuration.
Attached is the video link for your reference:

Regards,
Hariprasad Jain

[Hari_prasad_jain]

Here is the youtube video link:

[Larez (Femi Animashaun)]

Without being an expert, could it be that your compass needs calibration?

[mtnsurveyor (curt carroll)]

@hosein_gh

Mentor, Is this a motor failure?

[hosein_gh (Hosein Ghanbari)]

yes there is a motor or ESC fail in log