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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › Vibration in tail
09-16-2009 04:42 PM  11 years ago
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StickShaker

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lafayette, in USA

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Vibration in tail
I have a slight vibration in normal mode. When I switch to idle up, the tail vibration is really bad. I changed the tail rotor shaft and put on new tail blades. I also changed the main shaft and main blades just to rule them out. Any ideas?
Thanks
I keep telling myself this is FUN
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09-16-2009 04:50 PM  11 years ago
KCinNC

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Mooresville, NC

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have you cheked the Dampers in your head lately for wearnothing to it but to do it
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09-16-2009 04:55 PM  11 years ago
StickShaker

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lafayette, in USA

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I am not sure how to check them other that wiggeling the blade grips. There seems to be a little play there. I am using the trueblood dampners and they are not too old. nI keep telling myself this is FUN
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09-18-2009 05:15 AM  11 years ago
SkySurfer

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usa

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Check all of your head bearings.
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09-18-2009 06:34 AM  11 years ago
eclipso

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Tucson,Az.

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how exactly does one check all those little bearings ? what would be an endication of a bad bearing other than seized ? should you just replace them to be sure they are good ?
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09-18-2009 07:00 AM  11 years ago
jhhyah

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Taipei, Taiwan

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I have the same problem on my two 450s , and very bad (vibration) when fly inverted
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09-18-2009 08:36 AM  11 years ago
SkySurfer

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usa

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Check to see if the bearings feel notchy or rough in the blade grips,bearing blocks, and also replace your thrust bearings and dampers in the head. This is all standard maintenance and should be checked when you encounter vibration problems. When i start getting vibration issues its usally almost always a bearing issue either in the tail or head. Your thrust bearings wear out after awhile. Also check to see if your thrust bearings are installed correctly, it is very easy to install these backwards and will cause nothing but a headache.
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09-21-2009 02:14 AM  11 years ago
StickShaker

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lafayette, in USA

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I think that it is actually a bearing in the motor allowing the motor shaft to vibrate. I am running a medusa motor, does anyone know if the bearing is replacable? I had the motor out today and really didn't see anyway of opening it up short of prying it open. Any suggestions?I keep telling myself this is FUN
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09-22-2009 04:13 AM  11 years ago
joecass

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NJ

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i was struggling with a tail vibration for a long time. i got so fed up with it that i was going to sell it. what i found out is that when tighting down the tail case haves it would put to much drag on the tail case bearings. this would case my tail case bearings to wear out very fast. so i used lock tight on all the tail case bolts and tightend them up and than back them off a little. this heli is so smooth now i can hardly hear it
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09-22-2009 05:33 AM  11 years ago
outhouse

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auburn ca

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joecass shim the tail case its much better to have everything held tight.

OP hold the motor in your hand, spool it and feel for vibes if so then ya its bearing or new motor time.

im sure theres a way to crack the can. i have never owned a medusa sorry
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09-22-2009 05:20 PM  11 years ago
Rogman88

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West Monroe, LA

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I'm having similar issues with my 450V2. Bad oscillation particularly at slow head speeds (during normal mode at spool up). It smooths out somewhat at idleup 1 but the tail "skips" every 3 seconds or so where it jumps to the left then I guess the 401 gyro catches it and i centers slightly off to the left. It' driving me nuts. I've balanced the blades, put new tail blades and spindle on. I have true blood dampners. I've tightened up the belt to see if maybe it was slipping but still the same thing. I did feel one of the thrust bearings and if feels kind off like its not very smooth. I'll order some more and see if that helps.
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09-22-2009 10:30 PM  11 years ago
TomRex

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West Palm Beach Join Date: 12-28-2005

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I bet you bumpped the ground and bent a tail grip screw or bent the hub and didn't even know it. Ask me how I know after 4 years of rexesIgnorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact
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09-22-2009 10:44 PM  11 years ago
Rogman88

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West Monroe, LA

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Oh crap tom! I just took my screws off and rolled them on a glass counter and they weren't rolling smooth! I do think they are bent! How does that affect the blades? are they supposed to slip a little in the grips when the tail rotor is spinning? Would that cause the occasional slippage? Thanks!
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09-23-2009 12:15 AM  11 years ago
Nas1

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Macedon, NY

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I had a similiar problem and after changing everything, I found that my blades were not balance properly. After the balance it was smooth at low and high RPMs.
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09-23-2009 02:19 AM  11 years ago
TomRex

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West Palm Beach Join Date: 12-28-2005

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Hi Rogman88
I'm not talking blade screws but the actual screws that hold the grip to the hub.
This is a slop cure for the V2 tail slider along with the Fireup chinese balance mod. Notice no snuber pulley or tailbox spreaders, I've had this done way before Align came up with the Sport V3.

Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact
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09-23-2009 01:09 PM  11 years ago
Rogman88

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West Monroe, LA

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Nice Tom,
Is that fuel line wrapped aroung the slider arm?
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09-24-2009 01:57 AM  11 years ago
TomRex

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West Palm Beach Join Date: 12-28-2005

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3/16 shot of fuel tubing, slice a fuzz if binding occures, things still gotta be smooth. This pushes the slider tighter to the shaft to rid slop and high speed wag/occilation that happens from slop. It also makes for a more reactive tail. One thing to remember is there is no substitute for raw power. Good power makes for a most stable tail.Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact
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