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HelicopterMain Discussion › damper question
12-11-2016 09:06 PM  11 months agoPost 1
motorrc

rrApprentice

canton ohio usa

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what are the symptoms of worn dampers? And related question, how can I tell if the dampers are worn?

if it doesn't fit, make it fit.

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12-11-2016 10:07 PM  11 months agoPost 2
HilliHeli

rrVeteran

S.MI./FL.

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Any specific Heli (?)

With the smaller Mini's and Micro's I have always found that fighting to get the blade-tracking perfect has been 1 condition but I normally go by number of flights.

!Antriebe, die bewegen!
Henseleit-Helicopters.de
Jazz', Jives & vbar's
Futaba FASST / FASSTest

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12-12-2016 02:37 AM  11 months agoPost 3
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Blade tracking is the #1 sign .then you can get a head wobble not matter what head speed you try.

spending time, paying attention

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12-12-2016 04:59 AM  11 months agoPost 4
honda411

rrKey Veteran

Surprise, AZ USA

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Your fbl unit will go nuts sometimes also. Trust me. Mine did. Took forever to figure it out.

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades

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12-12-2016 02:54 PM  11 months agoPost 5
Richardmid1

rrProfessor

Leeds, England

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If you can move the blade grips up and down like a seesaw easily (flybarred) replace the dampeners or at least inspect them. If you can move the blade grips (seesaw) AT ALL and it's FBL, replace the dampeners.

As the blade grips are connected to each other via the feathering spindle, worn dampeners won't affect blade tracking.

The danger with worn dampeners is boom strikes and they could cause the slightly heavier dynamic blade to pull the feathering shaft off center causing excessive vibration.

60% of the time, it works every time!

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12-12-2016 05:00 PM  11 months agoPost 6
motorrc

rrApprentice

canton ohio usa

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dampers

ok, thanks for the help!

if it doesn't fit, make it fit.

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12-13-2016 09:34 AM  11 months agoPost 7
StevieM

rrNovice

Surrey UK

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"The danger with worn dampeners is boom strikes and they could cause the slightly heavier dynamic blade to pull the feathering shaft off center causing excessive vibration."
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Just about to post, and read this.
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ALL is balanced perfectly on my heli, and shafts dial-indicated to very tight tolerance.
If I come in too fast, overspeeding head in the flare, some sort of reasonance occurs, and an uncontrollable violent shake is triggered. I need to land and drop head speed slightly, then all silky smooth again through all manouvers.
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Tracking looks perfect at hover.
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I am wondering if head needs shimming to firm up dampers.
If I grab blade grip, I cannot create any movement away from the hub, if pull hard, however:-
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I am therefore wondering if there is a chance that the feathering shaft may be displacing very slightly laterally when head overspeeds, throwing centre of mass of blade/spindle system slightly off centre relative to hub, and sticks there until HS is dropped slightly?
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(forgot to mention, I have some slop in the lower mixer arms....can this introduce shaking?)
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Any comments would be appreciated.
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Many thanks, Steve

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12-13-2016 11:04 AM  11 months agoPost 8
Richardmid1

rrProfessor

Leeds, England

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I am therefore wondering if there is a chance that the feathering shaft may be displacing very slightly laterally when head overspeeds, throwing centre of mass of blade/spindle system slightly off centre relative to hub, and sticks there until HS is dropped slightly?
That is what I meant here:
they could cause the slightly heavier dynamic blade to pull the feathering shaft off center causing excessive vibration.
It could be a microscopic weight or CG difference between blades but at speed that is enough to pull the feathering shaft off center and once it's moved slightly the centrifugal force will pull it further exponentially.
(forgot to mention, I have some slop in the lower mixer arms....can this introduce shaking?)
Yes that can cause the blades to go in and out of track.

60% of the time, it works every time!

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12-13-2016 12:33 PM  11 months agoPost 9
StevieM

rrNovice

Surrey UK

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Thanks Richard.
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I will address one at a time, and see what solves.
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Rgds

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