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T-REX 550 › wobble
08-18-2014 09:33 PM  3 years agoPost 1
mrgnz

rrNovice

new zealand

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hi people I am new to runryder and have a problem with my trex 550e dfc and I have looked to see if anyone has the same problem without any joy. So the problem is this wobble it gets when I reduce the pitch in flight, it flys good when the blades are biting air (if you understand that) but that point just below hover the wobble starts and wont stop until I increase the pitch again. I have tried the obvious things and running high rpms and the more I run the stronger the wobble gets. so I am running at 85% where the wobble does not look to bad and once again I would like you all know that I have checked the obvious right down to losing the blades right off which seemed to help a little, which I did read some where now I come to the pros.

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08-19-2014 01:11 AM  3 years agoPost 2
Retired2011

rrElite Veteran

Lee's Summit, MO

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Is this a new heli, or one you have been flying a while?
Ever been crashed?
Did the wobble always exist?

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08-19-2014 03:50 AM  3 years agoPost 3
mrgnz

rrNovice

new zealand

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yeah it wobbled from new and its had a little crash just recently. I just cant seem to find it, I have replaced the main shaft, reassembled the head, changed the blades. I was hoping someone who has a 550 would post and tell me how there's goes.

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08-19-2014 10:10 AM  3 years agoPost 4
adamsz06

rrVeteran

Geilenkirchen Germany

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Any chance you could post some video of the wobble?

R.I.P. Roman

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08-19-2014 12:44 PM  3 years agoPost 5
Retired2011

rrElite Veteran

Lee's Summit, MO

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I recently fought a low headspeed wobble, finally realized one servo had developed some play.

Have you felt the movement on all of your servos? Maybe you had one with a problem from the start...

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08-20-2014 03:56 AM  3 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Which flybarless controller are you using and how is it mounted?

Can you describe the wobble a bit more?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-20-2014 08:35 PM  3 years agoPost 7
mrgnz

rrNovice

new zealand

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its a 3gx as you should be able to see. I will try to get some video as soon as the weather comes right. its kit flying weather here
https://rc.runryder.com/gallery/101738/390-.jpg

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08-20-2014 09:05 PM  3 years agoPost 8
mrgnz

rrNovice

new zealand

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that's supposed to be kite flying.

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08-21-2014 03:47 AM  3 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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What position are the slots at, in the two gain pots on top of the 3GX? Centered, at the default 12 o'clock position?

I can't see them clearly in your pics.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-21-2014 04:29 AM  3 years agoPost 10
turboomni

rrProfessor

East of the Equator

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Lets start and the very bottom,,,did you balance the blades? Have you tried loosening or tightening the blade bolts? Is the main Shaft true as well as the feathering shaft? Is the tracking of the mains good?
I have seen both main shaft and feathering shaft bent as new. I have seen main blades and tail blades out of balance as new. Start from the bottom and work your way up,,,otherwise you will be poking away in the dark.

Setup is everything, All my heli's can fly far better than I can pilot them

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08-21-2014 06:43 AM  3 years agoPost 11
mrgnz

rrNovice

new zealand

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yes they are both at 12 o'clock. I need to get that video up so people can see what's going on,but once again the weather here is no good. I checked to see if there was play in the servos and they seem fine, tracking ,balancing and shaft's are all good I haven't balanced the tail blades but I am pretty sure the problem is not there, the tail is strong and holds well. The heli is fly's well and handles fine it just when I take the pitch down in a slow decent the body of the heli starts to wobble and continues until I increase the pitch and start to climb again it looks shocking and I am worried that it will affect the gyro and cause a crash, By the way I am not a 3d flyer more of a sport flyer who like to move at speed. I would like to thank you all for your input and as soon as I can get out I will post a video. How do the dampeners in the head work? I am thing its the 3gx but what would a newbe know.

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08-21-2014 12:41 PM  3 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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Try turning the two pots on top so. The slots are at about the 10 o'clock position. Counterclockwise. See if this helps.

What does your throttle curve look like?

Are the main rotor blades tracking well?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-21-2014 01:27 PM  3 years agoPost 13
dkshema

rrMaster

Cedar Rapids, IA

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Other ideas...

If you're using a single layer of gyro tape, try two instead. If you need additional gyro tape, use this stuff:

Is the helicopter stable in a hover, but begins to wobble when you give it either elevator or aileron command? This would be an indication the two gain pots on top are set too high.

Wobble can be caused by:

Too low a head speed.
Soft head dampers.
Correct dampers, but not greased when installed.
A bent shaft
Blades not tracking.
Warped rotor blades.
Excessive aileron/elevator gain.
Vibrations getting to the gyro unit.

You may also want to redo your wiring from the RX to the 3GX, allowing a bit of slack between the cables and the 3GX unit.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-22-2014 09:06 PM  3 years agoPost 14
mrgnz

rrNovice

new zealand

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one again its blowing 20 knots of southerly here with a bit of cold sleety rain chucked in but looking at the forecast its going to come right tonight and be good for a week it the end of winter here in new Zealand so the days will be getting longer and the weather will get more settled. so today I will lengthen those wires and double up the tape and check everything once again but one thing came to last night, could it be time to buy a bigger heli lets say a 700 and if I was to do this what model would you all think, I really like align helis mind you I have only ever had three, a honey bee, a raptor and now the trex and I think the trex is a much better setup. I also have all the electronics from the raptor 550e that could be recycled into a new model.any advise will be taken on, cheers people.

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08-24-2014 09:43 AM  3 years agoPost 15
lightningrc

rrElite Veteran

UK

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R u def flying with enough head speed ?
The heads are so stiff on these , they not like to be flown around at low head speed .
Or wobble and shake etc .
Do you fly in idle up ?
I prefer no gov set up in mine and just run 100 90 100

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08-24-2014 08:00 PM  3 years agoPost 16
mrgnz

rrNovice

new zealand

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yes I do fly in idle up and the higher the head speed the stronger the wobble gets so at the moment I am flying at 85% where the wobble is not so bad. I am able to get out to the field this morning so I have a couple of things to try so I will keep everyone updated. cheers

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08-24-2014 08:28 PM  3 years agoPost 17
lightningrc

rrElite Veteran

UK

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Hmm must be some thing out of balance or bent . take tail and main blades off and run it up
On bench
I had an annoying issue with my 700dfc around 15 months ago ,turned out just to be a bent bolt on blade grip arm , changed every thing before I found it .

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08-24-2014 10:25 PM  3 years agoPost 18
turboomni

rrProfessor

East of the Equator

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As I said before start at the bottom and work your way up..especially if the helicopter is new to you or has been crashed..many times new parts are out of spec. I bought a new mainshaft from Miniature Aircraft years ago. I check them and spindles before installing. Mainshaft was bad and didn't install it. You shouldn't guess and poke around. Be methodical ..you will save time in the end.

Setup is everything, All my heli's can fly far better than I can pilot them

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08-25-2014 12:57 AM  3 years agoPost 19
dkshema

rrMaster

Cedar Rapids, IA

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I'm assuming this is a new build helicopter, not a used, or recently crashed one.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-25-2014 01:15 AM  3 years agoPost 20
Retired2011

rrElite Veteran

Lee's Summit, MO

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I'm assuming this is a new build helicopter, not a used, or recently crashed one.
Apparently, it has been going on from the beginning.
mrgnz
yeah it wobbled from new and its had a little crash just recently. I just cant seem to find it, I have replaced the main shaft, reassembled the head, changed the blades. I was hoping someone who has a 550 would post and tell me how there's goes.

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