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Helicopter
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Mikado
Logo 500 › Logo 500 tail vibration
06-01-2009 03:29 PM  8 years agoPost 1
jobebra

rrNovice

Canada

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I have been flying my logo 500 for over 6 months and all the sudden I got the tail vibration problem (without any modification or changes). I got less vibration after replacing those O rings in the head but still...the problem doesn't go away completely. The Tail Boom Holder was broken (overtighted those screws) previously but it has been replaced already. The problem would go away after 2 mins or so (lower voltage and headspeed). Here's the check list in my mind:

1. Bad Bearing?
2. Gyro Gain value too high?
3. Need a new drive belt?

What else should I check? Thanks!

Here's my setup:

Logo 500 3D - VBAR 4.0
Tail Servo: Futaba 9254
Cyclic Servos: Futaba BLS 451

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06-01-2009 04:22 PM  8 years agoPost 2
WeatherB

rrVeteran

Toronto - Canada

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What headspeed are you running?

I found that I have this very issue myself when running headspeeds higher than 2,000rpm. I just took the entire tail apart last night and put it back together. Nothing looked obviously wrong.

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06-01-2009 04:29 PM  8 years agoPost 3
jobebra

rrNovice

Canada

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What headspeed are you running?

I found that I have this very issue myself when running headspeeds higher than 2,000rpm. I just took the entire tail apart last night and put it back together. Nothing looked obviously wrong.
The headspeed for the first 2 mins is over 2300 rpm for sure. I don't think I would have problem if the HS is around 2000 rpm.

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06-01-2009 04:32 PM  8 years agoPost 4
NTM

rrVeteran

Lloydminster, Alberta, Canada

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If it's a high frequency horizontal vibe, check the pinion to main gear interface.
Make sure the mainshaft/motor shaft isn't moving up or down.

If it's a high frequency vertical vibe check the tail assembly.

If it's a low frequency horizontal vibe, check the head assembly (especially the thrust bearings), blade tracking etc.

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06-01-2009 04:40 PM  8 years agoPost 5
jobebra

rrNovice

Canada

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If it's a high frequency horizontal vibe, check the pinion to main gear interface.
Make sure the mainshaft/motor shaft isn't moving up or down.

If it's a high frequency vertical vibe check the tail assembly.

If it's a low frequency horizontal vibe, check the head assembly (especially the thrust bearings), blade tracking etc.
Thanks NTM, I am sure it's high frequency horizontal vibration. I will check out the interface between maingear and motor pinion.

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06-01-2009 04:54 PM  8 years agoPost 6
MrMel

rrProfessor

Gotland

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Plastic tail-case?

I chased a high frequency vibe on my L400, turned out to be a hairline crack in the tailcase just next to the pitch-lever arm.
Common if you overtighten the screws on those.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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06-01-2009 06:16 PM  8 years agoPost 7
JEEPWORLD2002

rrKey Veteran

BLUEBELL PA USA

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high speed horizonal vibe could be the tail blades and hub so on. what tail blades are you running ?

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix

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06-02-2009 02:49 PM  8 years agoPost 8
jobebra

rrNovice

Canada

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Thanks guys. I will check out the tail case for sure. I am running 85mm RotorTech tail blades.

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06-02-2009 04:19 PM  8 years agoPost 9
WeatherB

rrVeteran

Toronto - Canada

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My vibrations dropped substantially after the re-build.

The only thing I really did was add some R48 retainer to the bearings in the tail case. Before they were just pressed in.

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06-02-2009 10:12 PM  8 years agoPost 10
OICU812

rrMaster

Edson, Alberta, Canada

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Usually the higher rpm will show balance issues, do certainly check your tr blades for their balance, and as well all the things being brought, up all really good advice.

...Once upon a time there were Nitros, flybars and frequency pins...

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