Is my CG terribly off?

Hi all - recently build a quad and have been testing it the last few days.

ArmExtensionGif1.gif

Yesterday when I came to land I noticed the copter was leaning forward a lot - so much I had to pull back the stick to level and land nicely (otherwise it would of crashed on it's face). When I got to the copter the front right motor (1) was much warner than the rest.

Here are the motor outputs during this event:

copter-badmotor1.JPG?width=500I was surprised to see how diverged the motors were - granted this was a normal flight, not just hovering the entire time.. you can see lines 4400-6000 i was lotering and my 1 motor is working much hard than 3.

I replaced motor 1 with NO changes to my CG and hovered for 15 minutes:

copter-badmotor1replaced.JPG?width=500

I'm just curious if the above is what I should expect, or are my motors still divirging too much due to CG being off? I don't have a baseline for what this should look like, nor offsets of 'acceptable' limits so I would really like some (any) input.

logs attached.

Thanks!

Raph

hovering.log

possible bad motor.log

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • CoG isn't normalyl too bad, if it's only slightly out - the stationary yaw in zero wind will show up any weakness there - a CoG that's off will have the quad start a wide circle, rather than stay on the spot.

  • I personally think that looks fine (hovering log), you could try and balance them out more, but I wouldn't bother.

    edit, great looking folder :)

This reply was deleted.

Activity

Chris Anderson liked Zara Mae Pickering's profile
May 21
Azjeg liked Azjeg's profile
Apr 27
Benewake LiDAR liked Benewake LiDAR's profile
Apr 12
Gremsy liked Gremsy's profile
Mar 12
More…