Tiger Motors 4114-9 400 - problems

[kjetilpa]

Tiger Motors 4014-9 400 - problems

I installed brand new T-Motors 4014-9 400 on my hexacopter a month ago.
They are used with 17 inch props and a NAZA-M V2 fc.

I have had 30-40 flight with those motors with no problems at all. But on my last 2 flights I have experienced some problems.
Just after takeoff, I heard a strange sound from on of the motors (I dont know which) and the copter turned heavy to one side. At this time I thought it should crash to the ground. After a sec (or two) it was in a normal position, and the strange sound was gone. This has happend three times.

When running the motors (without props) on my bench I cant find anything strange. After 10 min the temperature of all motors are equal. No vibrations.

Any idea on what the problem could be?

This is the onboard video fro two of those incidences:

Kjetil

 

[maxwelltub]

why do you think its the motor and not the FC? how hot do they feel on landing?

 

[fltundra]

Motor sync issues! Are you using the matching T-motor escs?

 

[kjetilpa]

Not hot - only warm. When i testet them on my bench (without props) I measured the surface of each motor to 45-48 degrees celsius.
I have never experienced this problems before on my multicopter. The only thing I have changed on the copter previous to this incident is mounting a servo based gimbal - connected to the Naza. Colud this cause this???

If you listen to the motor sound in the video I think there are a problem with the bearing in on of the motors. What do you think?

Kjetil

 

[kjetilpa]

I am using a 40A DYS esc. Not a T-Motor esc.
But I have 30-40 flights with those ESCs and my new T-Motors.

Kjetil

Motor sync issues! Are you using the matching T-motor escs?

 

[kjetilpa]

The sound of your motor is similar to what I can hear on the onboard video.
Is changing the ESC´s the way to solve this, or can they be configured in a better way?

Kjetil

 

[fltundra]

The sound of your motor is similar to what I can hear on the onboard video.
Is changing the ESC´s the way to solve this, or can they be configured in a better way?

Kjetil

As I understand, only the T-motor esc's will work with those motors. Many have had the same issues. Maybe someone with your motors will chime in.