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Home✈️Aircraft🚁Helicoptere-AlignOther › Violent head vibration
09-10-2006 05:15 AM  14 years ago
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Xtreme34

rrApprentice

Crestview, Florida

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Violent head vibration
Any ideas? At first i thought it was a bent shaft so i replaced with titanium . still vibrating ( clearly in the top of the head ) when i spool it up its fine till it gets above 2400 rpms. i dial indicated the head ( align ) and dialed the shaft which are both perfect. changed paddles to no avail. then setup the flybar perfectly with calipers still no better. inspected the cage, seesaw,mixing arms,all links. everything appears to be in excellent condition . It runs very good till above 2400 then just goes into violent head shake . if i let it continue that way it looks tho it would just disintegrate into a million pieces.
spindle replaced

align head and gribs
microheli flybar system
stock paddles
sab blades 315mm
stock main
aon 3500
microheli frame set
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09-10-2006 05:17 AM  14 years ago
Xtreme34

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Crestview, Florida

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best pic i have

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09-10-2006 05:24 AM  14 years ago
trex3d

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St. Louis, MO

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Without more information about your heli I can't say a lot. But I would first start with the feathering shaft. I didn't see that you mentioned changing it. It's an often overlooked item.

Next, check all linkages, flybar and paddle to EQUAL lengths and a few more things. With some persistence in inspection you should be able to find the culprit.

Nice to see a photo, but it's a bit blurry to look into detail.

Best.
Trex SE.
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09-10-2006 05:25 AM  14 years ago
Xtreme34

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Crestview, Florida

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ahh yes spindle sorry it was replaced aswell
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09-10-2006 06:11 AM  14 years ago
lowflyer101

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garden grove, CA

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check all the links,, flybar length, blades balance/tracking.
take off all your blades,,, spin her up to find out where vibra came from
<-freedoom flyer->
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09-10-2006 06:59 AM  14 years ago
Hummingbird3D

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California

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The other spinning part is the main gear. Many have complained that it isn't truly circular. Even though it isn't at the top, it still can transfer an imbalance. Just a thought to try.

Also if the motor isn't operating smoothly, as in some type of oscillation?
Fly It Like You're On The Simulator!
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09-10-2006 07:49 AM  14 years ago
caseyjholmes

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Portland, Oregon

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still vibrating ( clearly in the top of the head )
Check the rotor head hub. (thing the feathering shaft goes through)
Mine had a slight vibe due to the rotor hub being crashed before once.
Have you crashed it before? It's possible you bent your rotor head hub..
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09-10-2006 04:41 PM  14 years ago
MikeInMobile

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Mobile, Alabama

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Replace the main shaft bearings. These are noted for having this issue!
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09-13-2006 04:55 AM  14 years ago
Xtreme34

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Crestview, Florida

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heres what i found to date . i removed the whole head off and spooled it up .i think it could be in the tail .when it spins at hi rpm i can feel a vibration in the boom . i dont wanna get fingers to close to the tail blades and you know why. i dial indicated the output shaft and tested the tail blades both are fine.what else could it be any suggestions will be tried.
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09-13-2006 05:55 AM  14 years ago
chan

rrApprentice

kr

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I don't know exact name, but,
Detach mixing arms attached in flybar part(I don't know name)
It might be bent one of them, so you can compare two if its identical
Hornet,FP helis,Trex450 series,V100D01,mCP x and more
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09-13-2006 05:55 AM  14 years ago
OICU812

rrMaster

Edson, Alberta, Canada

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Have you checked the tower that goes from top frame and surrounds the mainshaft with the bearings in it? Check closely, also check the clamp that you secure that with on the top, I had this frame, many, many moons ago and the same situation, it was the tower being cracked as the bracket had broke that holds the tower secure....Once upon a time there were Nitros, flybars and frequency pins...
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09-13-2006 10:14 AM  14 years ago
Tatayoyo

rrApprentice

Belgium

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Tail
I had a similar issue and it was coming from the tail :

Check everything there, mechanical setup as well as eletronic setup : gyro sensitivity, rudder direction, gyro direction, ...

I my case, it was the gyro sensitivity set too high (was at 75% - 55 is enough). Instead of a usual tail wagging i had a heli balancing and shaking...

It it doesn't come from there, check the tracking of your bell shaft.

Thomas
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09-13-2006 05:24 PM  14 years ago
TrexRookie

rrKey Veteran

San Francisco, CA

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warped main gears can do that too.. also check your 1-way bearing to make sure it's not slipping or anything... I had a warped main gear once and gave me a violent tail wag, but when I swapped out the main gear with a microheli main gear, the heli flew like a charm...
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09-13-2006 11:20 PM  14 years ago
clive45

rrVeteran

NSW Australia

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??
Just something on a different note. Move the gyro under the boom somewhere before it gets nocked off by the paddles/blades in a crash.
You dont say if this heli has flown yet. If not check what timing setting you have for the motor. I had an EP8 heli that would do the same thing, set the timing to high and it was as smooth as silk. I would not even lift off without trying to shake the heli to bits.
Just a thought
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09-14-2006 05:34 PM  14 years ago
TomRex

rrElite Veteran

West Palm Beach Join Date: 12-28-2005

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Try and remember to spool it up and check the rotor head with the blades off! That should give you and indication where the vibe is.Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact
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09-14-2006 05:41 PM  14 years ago
Droid

rrElite Veteran

Deep down in the Southwest- UK

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Have you tried increasing the damping in the head, i added an additional o ring makes head very tight, downside is the oscillation at lower rpms, but we want high headspeed anyway!!Quotes may have been changed for my own amusement
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