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HomeAircraftHelicopterMain Discussion › Gy611/9256 Engine vibs
01-08-2018 12:51 AM  7 months agoPost 1
InvertedDude

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USA

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I just started running into a problem. The gyro behaves like it has too much gain. The tail bounces back and forth small quick movements.

I swapped out Gy611 gain pot sensor....same issue

Swapped out 9256 servo....same issue

Tuned engine more precisely....same issue

Check clutch and belt....replaced....same issue

I did notice the OS 50 Hyper engine seems to have more vibration than my 32/37 engines.

Been flying like this since july 2017 with no issues. Great powerful helicopter, most powerful one in my fleet.

Only thing I can do is to rebuild engine....bearings or swap out the fan for a metal one?

I am stumped here....any suggestions?

Helicopter is Raptor 50 Titan.

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01-08-2018 01:01 AM  7 months agoPost 2
spaceman spiff

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Tucson

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Tail linkage a little tight? If the pushrod linkage binds too much it creates delay in the control loop.

The 611 had an unusual vibration damper if i recall corectly it was a stack, one layer of double side tapefoam, a metal plate, another layer of the tapefoam then the sensor.

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01-08-2018 01:03 AM  7 months agoPost 3
InvertedDude

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USA

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spaceman spiff
Tail linkage a little tight? If the pushrod linkage binds too much it creates delay in the control loop.
Yes, new ball links....they are TIGHT!
The 611 had an unusual vibration damper if i recall corectly it was a stack, one layer of double side tapefoam, a metal plate, another layer of the tapefoam then the sensor.
I got that covered!

Swapped out my Quick UK ball links heavy duty ones for the factory TT ball links on both ends.

Will fly it tomorrow to see.

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01-08-2018 01:13 AM  7 months agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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Sticky ball links or bad thrust races will both cause this issue.

Let us know what you find.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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01-08-2018 01:15 AM  7 months agoPost 5
JuanRodriguez

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The Villages, Florida

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You don't say what heli this is on but......

Disconnect the push rod at the servo end and by hand, make sure that the movement of the tail system is silky smooth.....adjust as necessary.....

Been there, done that and old enough to know better.....

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01-08-2018 01:30 AM  7 months agoPost 6
ICUR1-2

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Ottawa, Ontario

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If it was ok before and just started happening all of sudden ... then chances are the engine rear bearing is about to fail or has gotten notchy . ..

spending time, paying attention

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01-08-2018 02:26 PM  7 months agoPost 7
Four Stroker

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Atlanta

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Also misaligned pushrod guides. Drag OR slop will cause this. Did you recently boink the heli and rebuild ?

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01-08-2018 06:52 PM  7 months agoPost 8
InvertedDude

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USA

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Four Stroker
Also misaligned pushrod guides. Drag OR slop will cause this. Did you recently boink the heli and rebuild ?
No crashes and everything is straight and true.

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01-08-2018 07:10 PM  7 months agoPost 9
Four Stroker

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Atlanta

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Make sure the tail shaft bearings are not worn out allowing the shaft to move in and out.

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01-08-2018 07:41 PM  7 months agoPost 10
ICUR1-2

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Ottawa, Ontario

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Four Stroker
Make sure the tail shaft bearings are not worn out allowing the shaft to move in and out.
That's possible.. a bad bearing can cause problems.

spending time, paying attention

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01-08-2018 08:41 PM  7 months agoPost 11
InvertedDude

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USA

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Update
I found a magnet fly off on the fan. So I replaced the Stock fan with no magnets. The high vibs are much more reduced. The helicopter has the same issue but much more reduced. Doesn't behave like a high gain, now it just hard to describe. I went ahead and replaced the gy611 brain box, same issue. I installed smaller tail 85mm blades and increased gain, same issue.

I replaced the wire extension for the 9256 with gold contacts and re-routed the wires away from everything. It still has that light wag, it is not consistence. I can fly it around with no issues and full throttle...no issues.

Just shows a very light wag on the tail in hovering. I am wondering if this is normal for a belt driven at high rpms? I can swap out the complete tail case for a new one to see if the problem goes away.

The only other thing to replace is the voltage regulator or RX.

After a few more test flight, decided to try out a new TX. The issue is still there but much more reduced. I even went checking tail rods and adjusted them to reduce as much friction as possible.

Tore engine down to inspect everything....no issues in engine after 4 gallons!

Only thing left to do is swap out complete tail case, power supply or RX.

Might need to check dampeners?

This is where I am currently at. Don't get me wrong, I can go fly the hell out of it. It doesn't wag in flight...only in hovering...very light wag.

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01-08-2018 08:50 PM  7 months agoPost 12
crflyer

rrApprentice

Maine

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As Dr Ben stated, and in my own experience, check the thrust bearings in your tail grips.

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01-08-2018 10:03 PM  7 months agoPost 13
InvertedDude

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USA

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crflyer
As Dr Ben stated, and in my own experience, check the thrust bearings in your tail grips
Complete new tail housing with all new bearings and plastic. Flight characters are improved in hover, but still has a very light wag.

I am wondering if my engine is misfiring at low rpms?

FYI, my raptor titan doesn't have thrust bearings in the tail rotor housing. Only double stacked bearings.

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01-08-2018 10:09 PM  7 months agoPost 14
InvertedDude

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USA

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Four Stroker
Make sure the tail shaft bearings are not worn out allowing the shaft to move in and out.
No slop or movement...checked!

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01-08-2018 10:10 PM  7 months agoPost 15
JuanRodriguez

rrProfessor

The Villages, Florida

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Have you tried different brand tail blades ? (maybe you did and I missed it)

And did you balance the blades ? Balance the tail rotor assembly (as an assembly ?)

And the new tail housing included a different tail rotor shaft ?? Or just the housing with the same shaft ??

From your first post:
Been flying like this since july 2017 with no issues.
If it was fine before then something is obviously amiss........

Hopefully you'll find it.....

Been there, done that and old enough to know better.....

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01-08-2018 10:32 PM  7 months agoPost 16
InvertedDude

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USA

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JuanRodriguez
Have not balanced anything. I will try a different set of main blades.

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01-09-2018 12:46 AM  7 months agoPost 17
JuanRodriguez

rrProfessor

The Villages, Florida

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InvertedDude
Have not balanced anything
Wow, really ?? That would be a great place to start......
InvertedDude
I will try a different set of main blades.
I would try a different set of tail blades first ...... after you balance them ......

Is this the same heli that the pipe fell off a while back ??

Been there, done that and old enough to know better.....

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01-09-2018 01:24 AM  7 months agoPost 18
InvertedDude

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USA

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JuanRodriguez
No, this is the Raptor 50 Titan, this is my only full out 3d machine. All out power, all out bling. I have never balanced any blades in my lifetime! LOL

I have flown this machine 7 times today. I am tired of trying to figure it out! LOL! I am wasting fuel!

How about I get a video, maybe I am just too picky?

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01-09-2018 01:31 AM  7 months agoPost 19
JuanRodriguez

rrProfessor

The Villages, Florida

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Sounds like you’ve wasted an awful lot of time “chasing your tail “ on this one
Time to close the thread, I guess

Been there, done that and old enough to know better.....

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01-09-2018 06:11 AM  7 months agoPost 20
InvertedDude

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USA

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I think I found the problem!
Won't know until I fly it tomorrow AM.

Any guess what may be off on my setup???

In my defense, there were a lot of parts laying around. No excuse, but still you guys are on the same boat as I am! LOLOLOL! J/K!

Okay, on futaba gyros 401,602,611, and 701...what is the most ideal location for the ball link on a servo horn? YUP!!!

I measured it, I had 11mm....it is supposed to be ideal at 12mm or 13mm is the most ideal distance from center of servo horn.

I am retarded and the retard is strong on RR! J/K!

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