RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1233 views POST REPLY
HomeAircraftHelicopterMain Discussion › Goblin 630 drifts forward
04-01-2018 11:08 AM  3 months agoPost 1
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

Hi guys,

Am using a VBar neo with vcontrol on a goblin 630. I have a vexing issue in which the Heli always drifts forward in flight. Can’t hover in a single spot without correcting for forward drift actively. Has this something to do with the angled offset in the design of the goblin (the mast is not perpendicular to the ground)?

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2018 02:41 PM  3 months agoPost 2
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

Is the swash leveled with the main shaft?

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-01-2018 02:47 PM  3 months agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

Jamovich
Has this something to do with the angled offset in the design of the goblin
No. It's a set up issue and a hammer wont cut it

Mast is perpendicular to frame. Tilt is relative to landing gear.

Set up as you would ANY other heli.

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-01-2018 03:35 PM  3 months agoPost 4
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

you would be surprised on the range of issues a hammer can resolve...but sadly I agree it won't help much here

Yes the swash-late is leveled according to the mast but not the ground (I used a swash leveler to be sure). Yet the Heli has a pronounced forward drift that I must correct for in a hover.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2018 04:02 PM  3 months agoPost 5
S.Favorite

rrVeteran

Brookville, OH

My Posts: All  Forum  Topic

Check for high vibration levels.

Citizen #27

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-01-2018 04:06 PM  3 months agoPost 6
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

Vibration levels are within acceptable levels according to the vcontrol logs

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2018 04:25 PM  3 months agoPost 7
wjvail

rrKey Veteran

Meridian, Mississippi

My Posts: All  Forum  Topic

Sometimes when I have a problem that seems ill-defined, the solution is to "fix everything". By that I mean, go back and check your setup beginning with the transmitter trims and sub-trims and end with the FBL setup and whatever swash trimming tools your TX may offer.

You have a swash-plate leveling tool right? https://www.google.com/search?q=gob...kFzGRT-RAWZp7M:

Don't forget to check your helicopter's CG. Make certain the rotor disk is level when you pick the heli up by the head button.

In short, just make sure everything is "right".

I know this isn't very helpful and I know it isn't a quick fix. It just very difficult to trouble shoot such a nebulous problem and particularly difficult on a public forum.

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2018 05:33 PM  3 months agoPost 8
HeliOCD

rrVeteran

San Diego, CA

My Posts: All  Forum  Topic

Re-calibrate Tx.

Its all earth!

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2018 07:17 PM  3 months agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Somewhat nose heavy?

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2018 12:12 AM  3 months agoPost 10
mr dan

rrVeteran

Stockton Calif

My Posts: All  Forum  Topic

Optimize that Swash!

"R.I.P Roman" Citizen 0094 in the Nation

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2018 06:06 PM  3 months agoPost 11
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

My Posts: All  Forum  Topic

3 Things to check:
* Nose heavy (as stated by dkshema).
* Zero out the drift by adjusting the swash links (not the servos).
* Or both.

No matter how perfectly you level the swash, 99% of all helicopters will still need to have their swash links adjusted to zero out the drift at hover.

Assuming you set the servo arms perfectly at 90* and you perfectly leveled the swash using your favorite method, tool or technique, the heli will most likely and consistently drift in the same direction while in hover (inverted or upright).

While the direction and speed of the drift may be unique to your heli, the solution is universal and the same since the stone-age (AKA: "The time before Flybarless".)
My Goblin 650 Black Nitro drifted backwards and to the left (similar to your G630).

You can zero it out by following these steps:
Hover and observe the drift.
Land.
Adjust one (or two) swash links (not the electronic servo centers) in the direction that counters the drift.
Hover again.
Repeat until the drift is close to zero or you get bored.

It is not related to the gyros, the accelerometers or the gain.
It is not related to the stance on the ground while the gyro powers up. The nose being tilted up or down, left or right while it is resting on the skids does not affect flight.
It does not matter if it is MSH (iKON / Brain, VBar, Futaba - etc).
The designers / developers of the MSH gyros tell you this straight out.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

PM  EMAIL  GALLERY  Attn:RR  Quote
04-03-2018 02:36 AM  3 months agoPost 12
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

Thanks everyone for your tips

PM  EMAIL  GALLERY  Attn:RR  Quote
05-01-2018 10:19 AM  82 days agoPost 13
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

hi guys,

Update on this. On some days the Heli drifts backwards so it isn't a CG or swash-plate level issue?

PM  EMAIL  GALLERY  Attn:RR  Quote
05-01-2018 11:18 AM  82 days agoPost 14
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

Just how bad is the drift? Are you sure it's not just the wind? Have you tried increasing the cyclic gains? Anything loose or too tight in the head mechanics? Tight ball links could cause the heli to struggle to find 'center'.

Could also be the pots in your TX, do you have another heli to test?

Which servos? You elevator servo could be on it's way out, do lots of bench tests to make sure it always returns to the same position.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-01-2018 01:01 PM  82 days agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Basic questions - is this your first helicopter, and are you expecting the electronics to keep the heli in a fixed position at hover with no pilot input? Helicopters, no matter how well trimmed and set up, require constant user input to maintain a fixed stationary hover.

Consider as noted above the servos may not return to the same neutral position, and account for excessive vibration getting to your Neo sensors. Also consider that your TX sticks may have a slight centering problem.

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
05-02-2018 03:23 AM  81 days agoPost 16
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

I do fly with the same radio on a nitro plane and I don’t notice any centering issues so it isn’t the radio...as for vibrations the log does not register any excessive vibes except during spool-up (tic tocs or high speed loops)-certainly never during hovering. I guess it must be just drift but it should be more random instead of being just either forward or aft (the drift is never to the left or right)

PM  EMAIL  GALLERY  Attn:RR  Quote
05-02-2018 03:50 AM  81 days agoPost 17
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

So this is your first and only helicopter?

In a hover, a helicopter may drift left, right, fore, aft, up, down, or any combination of these at any time. You're really flying them all the time, even before they lift off, and after they touch down. As long as there is enough lift to cause trouble, you need to be there on the sticks.

You don't say if you have any exponential dialed into the fore/aft, roll cyclic, and/or tail, but expo can be your friend to reduce stick sensitivity around neutral. Don't overdo the expo, that can make for a really weird flying heli.

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
05-02-2018 05:30 AM  81 days agoPost 18
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

hi,

no it isn't my first...probably my 5th or 6th...others are nitro and they don't have this tendency to consistently drift in a specific direction..its more random...thats why Im asking.

On the Vbar Neo there is an option to set auto trim for hover and I can't get that to work correctly...it is like playing with a yo-yo...I set the Heli back into a specific spot...let the sticks go and it drifts right back in the same direction (this can either be a forward or aft...never to the sides)...it is not a violent drift but definitely there.

I use only 10% expo on all controls

PM  EMAIL  GALLERY  Attn:RR  Quote
05-02-2018 10:31 AM  81 days agoPost 19
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

If it's only ever forwards or backwards it has to be something with the elevator servo. If the servo is functioning as it should and centering correctly every time it is likely an overly tight ball link on the elevator, have you checked this?

What head speed are you running and have you tried increasing the cyclic gain?

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-02-2018 10:37 AM  81 days agoPost 20
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

I haven't tried increasing the cyclic gain...as for the servoes(they are futaba BLS servoes) they look fine...I can try and loosen the links to check if thats a problem (how do I do that? My ball link sizer is meant for the smaller ball links found on hirobo type helis). Head-speed is at 1900-2200

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1233 views POST REPLY
HomeAircraftHelicopterMain Discussion › Goblin 630 drifts forward
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Sunday, July 22 - 6:02 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online