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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Can someone tell me how to balance the head and tail???
05-23-2010 09:30 PM  8 years agoPost 1
smallplanes

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S.C. ,SSA

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I've got a heli that has a mega vibration and i have a Dubro balancer but i don't know how to balance a head and tail. It is vibrating so bad on the tail that the tail fin is about to hit the tail blades and it broke the vertical fin. Can someone PLEASE point me in the right direction? I'm not going to tell the brand so please don't ask that part all i can say is it's a gasser. What would be a good blade balancer to buy the want break the bank? Thanks for any help i really really need it? Please help me out or give me a web site to go to that will help?

Thanks
Ivan

PS This is a gasser forum so lets not argue over what brand it is.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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05-23-2010 09:53 PM  8 years agoPost 2
neavissa

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Southern California

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05-23-2010 10:08 PM  8 years agoPost 3
smallplanes

rrElite Veteran

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Thanks i will take a look at them.

Thanks
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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05-23-2010 11:09 PM  8 years agoPost 4
smallplanes

rrElite Veteran

S.C. ,SSA

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I saw how to do the head but not the tail do you have another link? Everyone on here is a pro until you ask a hard question.

Thanks for any help
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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05-23-2010 11:52 PM  8 years agoPost 5
neavissa

rrNovice

Southern California

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I am not a pro and I never balanced a tail but I would think its done the same way?!

G

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05-24-2010 01:06 AM  8 years agoPost 6
smallplanes

rrElite Veteran

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What do you mean? Come on guys chime in and tell me how to do it?

Thanks for any help
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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05-24-2010 01:15 AM  8 years agoPost 7
airdodger

rrElite Veteran

Johnston USA

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Take the tail axle assembled and put on a high point.

Chris

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05-24-2010 01:55 AM  8 years agoPost 8
CT.Chopper

rrVeteran

Meriden, CT

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you have to get the blades centered in the grips first,
do this by disconnecting the links to the blade grip and find the cg on the blade my moving the blade in the grip and once it is centered and the grip is sitting flat crank down on the blade bolts to lock the blade in place, do this on both sides.

next pull the head and invert it and balance it by resting it on the flybar.

next you can mount it on the main shaft and you can adjust the robart balancer to put the main shaft through the small hole in the back and rest the front on top of the jewl bearing rollers..

someone will have to hold the back of the balancer to keep it from coming out of the base..

after you put the shaft and head on the heli with the blades still locked at their c/g point measure blade tip to boom on both sides (this will show if your head block or main shaft is bent.

most likely its the torque tube,out of balance tail blades or a bent tail shaft that is giving you grief..
hope this helps
it is the best way i can describe to you how to do what you want.

Rob Landry.

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05-24-2010 03:13 AM  8 years agoPost 9
woody37

rrApprentice

McAllen, Texas

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I use the dubro prop balancer. I take the tail hub assembly with the blades centered and check the balance that way. I will use small washers to counter balance the heavier blade. It has worked with all helis that I have owned. I will also weigh each blade just to see the difference. I found its better to balance on the hub assembly.

Woody

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05-24-2010 05:22 AM  8 years agoPost 10
jschenck

rrProfessor

La Vista, NE.

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almost every set of tail blades I check are out of balance. I do not go through a lot of effort to balance them and my heli's run smooth.

$20 Align blade balancer is all I use. Add packing tape to the tip of the lighter blade until they balance on the sea-saw. I do the same with my main blades. I don't check CG or weight anymore, just balance. It's a 5 minute job to balance blades for me.

for the bigger main blades
http://grandrc.com/inc/sdetail/63695

and add this for the tail blades, mains for the 450's
http://grandrc.com/inc/sdetail/21570

and this for the 250 and 450 tail blades
http://grandrc.com/inc/sdetail/169848

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05-24-2010 05:39 AM  8 years agoPost 11
pgkevet

rrKey Veteran

Wales

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Cheap way: bolt the blades together and balance head of bolt and round bit of nylock on rims of two water glasses (can use ice cubes too)

Watch at YouTube

pgk

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05-24-2010 09:31 AM  8 years agoPost 12
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Could it be engine vibration
causing the problem?

Team- unbiased opinion.K.I.S.S principle upheld here

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05-24-2010 10:47 AM  8 years agoPost 13
j.8

rrVeteran

Denmark

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Hi
It is vibrating so bad on the tail that the tail fin is about to hit the tail blades and it broke the vertical fin.
Could it be engine vibration

causing the problem?
Yes it could very well be a lean running engien

Regards Bo

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05-24-2010 11:29 AM  8 years agoPost 14
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Or an engine that is out of balance
What engine do you have?

Team- unbiased opinion.K.I.S.S principle upheld here

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05-24-2010 12:56 PM  8 years agoPost 15
Justin Stuart (RIP)

rrMaster

Plano, Texas

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On my flybarless 450, whenever I crash it and have to rebuild it with a new main shaft and blades, the first thing I do is to straighten out the new blades and tighten the grips. Next I unpop the 3 links that hold the swash. Then I pull the swash, washout base/swash driver, and the rest of the head all intact. I put this entire setup on my Dubro balancer. On the balancer, I put the one "plate" high in the back and put the shaft through the hole. For the other plate I put it "low" in the front and put the shaft in the "v". I can balance the whole head that way. This works because the 450 head is not that heavy. I think putting a gasser head on a Dubro balancer would damage the balancer, However, if you took two flat pieces of metal, you could do something similar.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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05-25-2010 01:00 AM  8 years agoPost 16
smallplanes

rrElite Veteran

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Do any of you run an indicator across the clutch shoe or just the hub? I just took my motor out to check the runout and i want to know the best place to check it? I have a 27cc in it now but i'm going to try it with a 23 in it and see if it's any better. Have any of you had problems with a brass collet in stead of just the taper like wally has his?

Thanks for any help
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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05-25-2010 01:07 AM  8 years agoPost 17
JuanRodriguez

rrProfessor

The Villages, Florida

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See PM

Been there, done that and old enough to know better.....

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05-25-2010 01:33 AM  8 years agoPost 18
jschenck

rrProfessor

La Vista, NE.

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check the fan hub and the clutch. When checking the clutch measure the solid part, not the shoes that swing out. Looking to get less than .001" runout there.

Here are some random pictures of my Vision and Predator clutches.

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06-01-2010 12:37 AM  8 years agoPost 19
smallplanes

rrElite Veteran

S.C. ,SSA

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When i took the motor out i checked it today and it was out .005 thou but when i put it in it had less than .002 runout. I worked on it for hours today and the best i can get the hub and the shoe is .002 thou is that good enuff,or will it still vibrate? I tried taping it with a plastic hammer a lot of times but .002 is the best i can get it. Should i put it back in or put the hub and fan and shoe on an extra 231 i have and see if i can get it better? Like i said before it has a MASSIVE tail vibration in the heli,to the point of breaking one boom in half and bending the second boom and breaking the vertical fin and the horizontal fin and never getting more than 6 inchs off the ground and it stripped my tail servo gears. What do i need to check first and last?

Thanks for any help
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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06-01-2010 12:47 AM  8 years agoPost 20
JuanRodriguez

rrProfessor

The Villages, Florida

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Ivan,
.002 is plenty good.... there must be something else wrong.

What happened to Shuttlepilot ? I thought he was helping you out with set up ??

Been there, done that and old enough to know better.....

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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Can someone tell me how to balance the head and tail???
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