F550 Twitching any ideas

hjls3

hjls3

Member
So check out the vid. On my 4th battery the 550 became real twitchy like the gains were too high and it was trying to settle. I have gains on slider button JR9503. Atti mode one slider Free mode other slider. Twitching happens during both modes at any gain setting. Got any quick ideas????

http://vimeo.com/39946215

Thanks for any advice. Love this thing even with a weird twitch, it is so much fun. Done flying until I can figure out the twitch though.
 

T

Tahoe Ed

Active Member
It looks like the FC is reacting quickly to the slight breeze that was present. What are/were your gains? Are you running 4S with 8" or 3S with 10" props? The hexa is a little more sensitive to wind than the F450. But they are not that far apart.
 

hjls3

hjls3

Member
Ed - yesterday I flew the 550 in big winds and it was super impressive. I am running 4s 8" dji prop. THe gains are set up on slider switch so that I can adjust gains on the fly. The middle position being stock settings. That is where I found it most enjoyable to fly. Really kind of at a loss for what it might be. Does twitch no matter what the gains are and does it in either mode. Nothing was changed from nice flights yesterday until twitching except battery charged.

On another note - is there a problem running 4s and 10" Graupners? That is my next move after I figure out the "twitching".
 

GotHeliRC

GotHeliRC

http://gothelirc.com
Hi,

Did you hook it up to your computer and look in the Assistant software to see if you're slider actually still changing the gain?
 

hjls3

hjls3

Member
GotHeliRC said:
Hi,

Did you hook it up to your computer and look in the Assistant software to see if you're slider actually still changing the gain?
Click to expand...

Got heli...that is next on the todo list as soon as my offspring are sleeping this evening. I have never had a switch un-bind itself from the mix. Is that something that can happen often? The radio is brand new as is the rx, so maybe...???Hope so, that is easy fix. Thanks you guys for the ideas though...it will get figured out soon.
 

TooManyHobbies

TooManyHobbies

Member
Could you make a video of what your doing?
I just received the DJI f550 from Patrick with a JR9503 too.

I'd love to see a video of your hands on the controller talking about the "on the fly" gains, settings, etc.
Videos seem to bring a quality of hands on relationships with the electronics.

My f550 has a few very minor automatic (attitude mode) correctional twitches while the breeze is present(they might just be my fault).
It's a great radio, I hear, but a bit intimidating at first glance!

Does your f550 boost upward during a flip of the switch from attitude to manual?

I am impressed with the f550, it just needs an understanding pilot to fly it perfect.
I think the f550 out of the box (from Patrick) is really stable, it just needs our personal understanding to "become one" with it.

Keep in touch,

We have the same kit and transmitter.
 
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T

Tahoe Ed

Active Member
Just a thought. Make sure that there is nothing that is around opening for the Baro. It could effect the altitude hold. As far as running 10's on the DJI 920kV motors, several do it with success. I have not tried it yet. I have been too busy going from a Naza to a WKM to a WKM with Data Link. I have Graupner 10's that I use on my F450 and have enough to swap them out. My guess is that it will be more sensitive to the wind and the motors might get a little warm. Gary G is flying with a Hexa on the stock motors, 10" Graupners, landing gear, gimbal and a large battery, over 3K total. He states that his motors are not past ambient when flying. I would not be afraid to do it, I would just be cautious until you get some time on the clock while trying it.
 

Aerial Media Pros

Aerial Media Pros

Member
Thad, when switching from Atti to Manual, I also get a little jump. I do make a note to myself to bring the throttle down a little bit before flipping it into manual.

I have been flying the 550 allot today, trying to replicate that twitching problem. So far no luck. I'll let you know as soon as I get a solution. I have also sent an email and have forward the video to DJI. I'll post up there response when received.

As for 10" props, I ran them on one of my first builds and had no problems. I switched to the 8's because that is what DJI recommends. However, once my Xoar props arrive, I will be flying 10's again :)

On that note, I do have a big order of custom Xoar props coming in (bore'd to fit DJI MOTORS perfectly). They will be 10x5 with prop bores of 8mm. People that have bought 550's from me already will have first dibs at the props for sale. If interested, PM me and let me know. I anticipate that they will sell out fast.

I hope to find a solution to the twitch soon. If any one else has a recommendation, feel free to chime it.

Thanks guys,
Patrick
 

C

chad2323

Member
Hi Patrick I'm also having the same problem. Tried every gain setting and it made no difference. I keep trying different things if I come up with a fix I will post.

Chet
 

TooManyHobbies

TooManyHobbies

Member
I wish you guys the best on the twitch.

Patrick just contacted us and helped me figure out some simple newcomer info for any gain twitch associated with our F550.
As I stated before, he built a DJI F550 hex ready to fly, with a 9ch JR9503 radio (7ch. receiver) and battery for us.

In attitude mode, I may have bumped the gain slider on my radio away from his "set position".
It is was slightly noticeable, but not enough to be considered significant.

Below is our (link) first maiden flight.
I'm not sure if the video I posted even shows the twitch from the DJI naza flight controller .

Take a look at his f550 kit settings straight out of the box (in video).
Sorry for my misinterpretations and errors in trying to help.
I very new to the f550, the software and my transmitter.

http://www.youtube.com/watch?v=2vWYBFqu8qc
 
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D

Dewster

Member
I had twitching on with my yaw. The craft would drift off of heading and then self correct after a second or two. I adjusted the gains for yaw back to 100 percent and the twitching stopped.
 

R

rcollie

Member
DJI F550 Naza+GPS started twitching violently after about a month of previous flying.

After buying and assembling my DJI F550 with Naza and GPS it flew fabulously for about a month.

I then bought some tall landing gear for it and it flew fine for about a week then the twitching started.

The first twitch was when I strapped my new Sony NEX-5R to the underside of my Hexa. It twitched forward but the weight was too heavy to recover and it crashed, below is the footage.

https://vimeo.com/56176810

After this I unassembled everything unplugged and replugged the motors from the esc's and all the Naza imports/outport. Reassembled and flew it again. The twitching is still happening below is a video of what it looks like.
The twitching happens in both ATTI mode and GPS mode.

https://vimeo.com/56176811

Im using a DX8, with standard stock DJI F550, DJI; props, motors, esc's....

I have checked Naza assistant and re-calibrated Naza and GPS. Everything seems to look right.

Any ideas of what to do would be greatly appreciated. Rather annoyed as have no confidence to fly and film with new Nex-5.

Thanks in advance.
 


R

rcollie

Member
Thanks very much. Do you have to get rid of the female bullet connectors in the esc's or just cut off the male ones and solder in to female? Bit worried of damaging things.
 

Roger Ramjet

Roger Ramjet

Member
rcollie said:
Thanks very much. Do you have to get rid of the female bullet connectors in the esc's or just cut off the male ones and solder in to female? Bit worried of damaging things.
Click to expand...

You just have to cut off the male connector (real close to the connector because there isn't a mile of extra play in the wire) strip to expose about 1/4 in of bare wire and solder directly in the brass female connector (fill it up real good with solder). To do that you will require to cut about 3/4 in of the large heat shrink of the ESC to access the female connector. All this is easily accomplished with a exacto knife. Make sure you mark your wires to respect rotational direction and place the new heat shrink BEFORE you solder..... don't laugh....I got caught once.... You will be very happy!
 



Roger Ramjet

Roger Ramjet

Member
Sorry, can not help you with this but post the question as a separate post and I am sure many of us are expert on this subject. If you are willing to spend that kind of money on a gimbal, you have to make sure you get the right one for your specific use.

Myself, I simply use a X-468 landing gear/gimbal. It has autolevelling on 2 axis with the NAZA controller and a separate tilt option for my Gopro2 camera. All of this will run you about 100 pounds. Works great for me but a NEX-5r is much heavier and sophisticated than my little Gopro 2.

Good luck, you have chosen a forum featuring a goldmine of information, friendly users and very knowledgable members.

Happy holidays from Canada.
 


J

jhardway

Member
ya looking at your post two things stand out to me, one is to check your bullet connectors for corrosion, it so cut them off and put new in place or solder directly to each other. the other look at your motors and see if they are all tight and feel the same as all the others. I had that happened once where it was flying real strange. When I got home and checked it out everything was fine. I then flew it again where I lifted off and lost a motor 20 second into flight. I got the copter down safe, or better said it came down undamaged. I then took a good look at it and it seems like a bearing went bad on the motor, and as I was looking around I found another motor with the same loose feeling. I replaced them both and have not had a problems since.

So as I was saying check the bullet connectors and make sure your motors are all consistent in they're look, listen, and feel categorizes.

good luck.
 

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