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HelicopterMain Discussion › nonfrequent vibrations in tailboom
04-28-2002 06:16 PM  15 years agoPost 1
Ted-swe

rrNovice

Sweden-Kungshamn

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I have a fury that I just built. And I have just ran a few tanks of fuel. But I have a serious problem with it. Big sideways vibrations in the tailboom. But they are not frequent. My tailservo works a lot and I don't know if it's the gyro that makes the vibrations or if the gyro reacts on the vibrations.
But in some rpms there is no vibrations. at maybe 1/4 throttle there is none.. but 1/3 it start to shake really much sideways. It's more than vibrations.. and when the rotor spinns down so the whole helicopter is going shaking with the rotor.. so It looks like there is a lot misplaced weight in the rotorhead. But I have checked everything that I can imagine that possibly will cause this.. I didn't tighten the balde bolts so hard is this a possible reason? And when I built the heli so I had to remove very little material from the mainshaft top (It wasn't possible to slide the swachplate on) and maybe this is a reason for it but I don't think so since it so near CG og the rotorhead. The blades I use are NHP carbon 680. I have vario weights on the flybar and original 3Dpaddles. Is it possible that the mainshaft is bent?
I a newbe so I don't know what to think about this..
I will no go and put it in pieces and control everything.

Greetings Ted:

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04-28-2002 07:41 PM  15 years agoPost 2
jetranger

rrVeteran

PERHAM M.E.

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vibartion

You should not have to remove or sand anything on the main shaft to get the swash plate on. There is a coating on the shaft to keep it from rusting, use some thinner to remove the coating thats all. You might have made the top shaft out of round and the head now does not sit square on the shaft.

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04-28-2002 08:41 PM  15 years agoPost 3
Krister T

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Sweden

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Om du har tid så kan du komma till Trollhättan under veckan så kan vi kanske lösa dina problem.
Hör av dig på 070-5448465

Krister T
http://home.swipnet.se/krilles_helisida/

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04-29-2002 12:13 AM  15 years agoPost 4
Vitya

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North York, Ontario

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Yeah........Right.......I'll go now........

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04-29-2002 12:44 AM  15 years agoPost 5
MrTotty

rrNovice

Franklin, TN

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Good Evening Ted,
Have you checked the sensitivity of your gyro? I had a Raptor 50 that I swore the tail shaft was bent or mainshaft. It would shake like crazy. Almost lost it a time or two. Turned out the gyro gain was set to high, turned it down and it worked like a champ!

-Chris

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04-29-2002 12:52 AM  15 years agoPost 6
furyextreme

rrApprentice

USA

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your head dampning might be too tight.
that would make it shake at low rpms.
also you need the blade bolts tight.
tracking??

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HelicopterMain Discussion › nonfrequent vibrations in tailboom
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