Quad with naza lite, wobble issues

[pasen]

8Hi.

Helping a friend with his quad.
Its a 680 quad-frame from tarot (not hexa), cant remember the name.

Dji opto 30a esc
Tiger 770kv motors
14x5.5" props
4s lipo
Naza lite.
Approx 2.5-3kg

With default gains the quad is uncontrollable and the wobble escalates as soon as you lift off, landing is nessesary after 3-5 seconds after liftoff to avoid crashing.

We have tried different gains without luck. Remount the gps, calibrated imu and tested with 10x4.5 props. With the smaller props the quad flies, but cannot maintain direction (yaw is drifting left). Compass calibrated several times. And when giving yaw input to the right the whole quad leans towards the side and starts losing control. Left is ok.


Any ideas? Recommended gain settings?
Our only option left as i see it is to try with a kk board to see if its a fc-related issue. We will also try with 12x4.5 props, but as its hard to fly with 10" im not that optimistic it will help.

What is a good starting point for the gains? Have tried using x1 to set gains in flight with no improvement.


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[cootertwo]

Just guessing, but sounds like maybe something isn't hooked up right. Go over the motor connections. If I remember right, Naza starts with motor "1" being front left, and counterclockwise around from there. Some others are different. GPS pointed forward? Naza MC centered and vibration free? I have a bunch of Naza's flying, and never had a single one that wouldn't fly and hover straight out of the box. After making sure everything is connected right, I'd go back to default settings. It's easy to get things all screwed up by adjusting the MC settings, when the problem lies elsewhere.:tennis:

 

[pasen]

Yeah. The thing is its flyable with 10 inch props. Buy yaw/rudder is drifting and acting wierd. It shouldnt be able to lift if the motors were not connected as they should? All stick inputs do what they should.

Props are balanced as well.

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[Tahoe Ed]

Try and change your gains to 145/145/130/150 and 90/90. See if that helps. The problem with swinging large props is that they are slow to react to speed changes from the Naza.

 

[AlienNet]

with a Tarot Quad Frame and tubular arms, you must check that all motors are pointing totally vertical with the body, i had same problem a while back and adjusting the motor mounts fixed the problem, also calibrate each ESC/Motor separatly and try again with Default gains to start with, hope you get sorted.

 

[OneStopRC]

As above, use a straight edge and run it from motor hub to motor hub and level motors as required. Tighten down and recheck to make sure they are still hub to hub level and nothing moved.

 

[kloner]

those motors aren't gonna do much more than 12" props, more than that and it's most likely got the hover throttle too low from over propped.... if you want to use them props, try adding a payload and see if it mellows out.

 

[pasen]

Ok.
I've done some research and the 14x5,5" props is probably to big as they are not even listed in T-motor specs.
But the quad is still incredibly unstable, even with 10x4,5 props. I may also add that this quad was bought second hand thinking it was a quick fix

Here is a video of us testing the suggested gains with the 14" props (we did the 10" too but not on film, and no improvement).

After that I thought we should try with a KK board as well, to see if this is a FC issue or not. And we are still not sure...
During the KK-board test it was still drifting slightly left and the right yaw was still slow. And at the end the quad crashed due to 2 of the motors stopped completly in air while I was testing max yaw/rudder to the right... ?!
Next thing we will try 12x4,5" APC props and try to adjust the motor mounts slightly. But we can still not figure out if this is a FC issue or hardware ESC/motor issue? Or just a bad setup.

 

[hjls3]

wondering would the size of that frame not be a good fit for the lite?

 

[cootertwo]

I'm just guessing, after watching the videos, but I'm thinking something to do with the motor/ESC combination, and ESC calibration. Maybe mismatched motors, or a bearing or 2 going bad ???? "Just a few guesses":tennis:

 

[pasen]

Yeah we have been thinking if there could be an issue with one of the motors but they seem to be working fine and thw bearings are snug and fairly quiet. The DJI esc's are not programmable for some reason... and shouldnt the naza lite be able to handle a quad of this size? Im having no issues at all with my 690 hexa with naza v2. Ans what about the kk board?

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[cootertwo]

I don't think the Lite should have any problem with that size quad. I noticed a strange "twitch" with both the Lite, and the KK2. That's why I'm guessing motor/esc Also the screech that can be heard occasionally, maybe a sync problem. ????

 

[pasen]

Problem solved with accurate motor alignment and new ESC's, not sure which one solved the problem.
However we will install new simonk ESC's, probably it will be even more stable. 14" props are not working yet though, 10-12" seem to be ok so we will go for that