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HomeAircraftHelicopterHelicopter Main Discussion › Blade 550 vibration
09-02-2015 12:23 AM  3 years agoPost 1
Friday Fly Day

rrNovice

Louisiana

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Hey everyone I was trying to get some opinions on my 550 vibration. So it's only when I'm in normal flight mode and hovering I can see a pretty decent amount of shake to the front end of the heli. As soon as I flip it in to idle up 1 the vibration goes away. I've never crashed this heli and I have just taken my entire head apart and my shafts look fine.

"Winning"

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09-02-2015 01:31 AM  3 years agoPost 2
EEngineer

rrProfessor

TX

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Have you balanced your blades?

Logo 600SXs, 800XX, TDR IIs

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09-02-2015 03:06 AM  3 years agoPost 3
Friday Fly Day

rrNovice

Louisiana

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No I haven't. Just bought a brand new set of switch blades thinking that may be the issue. Helped a little but it's still vibrating

"Winning"

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09-02-2015 04:20 AM  3 years agoPost 4
EEngineer

rrProfessor

TX

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But, if I understand properly, you did check the balance on your new blades?

If you haven't, check it...just to eliminate the easy stuff.

With the new blades, did you add any "blade tape" for blade tracking purposes?

Tape will had a "touch" of weight that throws "balance" off.

Just to eliminate the easy stuff...

Logo 600SXs, 800XX, TDR IIs

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09-02-2015 04:51 AM  3 years agoPost 5
EEngineer

rrProfessor

TX

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Now the not so easy stuff....and your heli has never been crashed...good...

When in "normal" mode(at a lower RPM), you have these vibes...

But, after going to IU(higher RPM), the same vibes appear to "disappear"?

Seems like some sort of vibes appear at "normal" mode RPMs.

You removed your rotor head and the "shafts" look fine...

Which shafts....main...or spindle? But they look fine. So, that's not the issue...right?

Check your bearings...gears...tail rotor drive...motor pinion to main gear mesh, etc.

Could be many things. Hard to tell at this point of your troubleshooting this issue.

Am used to the VBar FBL which has an "integral" R/T vibration analyzer. As I build my heli, I run up the motor with just the main shaft...and check the vibes...if ok, install the head, repeat...if ok, install the tail, and repeat...

Have to ask......but your swash links are "tight"...no slop...good.

One last question....I'm a fanatic about ensuring(with FBL helis, non DFC) that my swash follower arms are precisely "parallel" at "midstick" with 0-deg. of pitch on the main blades.

As a last resort, after checking anything that your can, just "reset up" your rotor head as if you needed to rebuild it.

Maybe something was misaligned a touch.

The good thing is that its only touched ground in the proper attitude....so it'll turn out to be a minor adjustment...that's hard to isolate....that's the "fun" of these contraptions....

Logo 600SXs, 800XX, TDR IIs

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09-02-2015 01:08 PM  3 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Please describe in more detail what you mean by "shake". Up/down, left/right, or both. Really fast or slow and lazy. Do they come and go, or is the shake constant? Does fore/aft or left/right cyclic seem to affect the shakes?

What are the tip of the tail boom and the skids looking like when you have the shakes?

How tight are the blade attachment bolts?

If you have something bent, higher RPMs usually makes the shakes worse, not better.

Are the rubber feathering spindle dampers dry or greased? Are they worn out?

Do you know what RPM (rotor) you are running at hover and in your idle up settings?

What do your throttle curves like for each mode?

-----

The description "shakes" is too vague for a proper diagnosis. Kind of like telling your doctor you have a fever and asking why.

-----
Dave

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

Team Heliproz

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09-04-2015 12:00 AM  3 years agoPost 7
HeimD

rrVeteran

the great southwest

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It's a Blade heli. And a 550X at that. "Enjoy" it as is since it's never been crashed. Things only get worse from that point. LOL

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09-04-2015 01:11 AM  3 years agoPost 8
Heli_Splatter

rrElite Veteran

USA

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You cannot tell a thing about shafts by looking at them. Roll them on a glass table... any wobble replace them. It could also be head thrust bearings, and even main shaft bearings causing the vibration. How is the blade tracking. Have you balanced the blades?

A tail vibration can translate... so it is hard to guess from here.

My money is on a bearing problem.

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09-04-2015 03:53 AM  3 years agoPost 9
Thunderrun

rrNovice

NC

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Head speed is to low at normal mode,get the head speed up

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09-06-2015 05:33 PM  3 years agoPost 10
chopper37

rrVeteran

NJ and Long Island

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Yup sounds like headspead issue, if something was bent it would vib in iu1, iu 2 also

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09-07-2015 01:10 PM  3 years agoPost 11
rcheliheaddaz

rrApprentice

Sth Wales / UK

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Vibration?
the tell tail speed being too slow in the rotor head is a nodding which can look like a shake if the speed of the rotor head is almost but not quite high enough. Try adjusting throttle trim and see if you can take care of it that way. Increase throttle speed without using idle up, so in normal flight mode adjust throttle speed at hover until it sorts it out.
It is normal for a balanced helicopter to have a nod of the front if speed is too low.
The fact you idle up and it is not still visible leads me to thinking it is your rotor head speed that is the issue.

Of course I am only guessing from your description of symptoms and your remedy.good luck hope you sort it out.

Regards Dazza,;

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09-08-2015 11:46 PM  3 years agoPost 12
Friday Fly Day

rrNovice

Louisiana

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Sorry everyone I've been out of town. I rolled both shafts on the glass table and couldn't find any wobble at all (was hoping that I would). Tomorrow after I work I'm gonna hover it and raise the head speed in normal mode and get back with y'all. Thanks for all the responses

"Winning"

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09-13-2015 03:32 AM  3 years agoPost 13
Friday Fly Day

rrNovice

Louisiana

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Well I flew today and it seemed to get worse. I turned up my headspeed in normal mode and that helped for a second. after a bit of flying it started shaking and wobbling again. flipped the heli in idle up and It started vibrating. that was the first time it vibrated in idle up. I noticed that the main gear wobbles a bit. could this be causing some vibration?

"Winning"

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