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Home✈️Aircraft🚁HelicopterAlignT-REX 600N › Bad Vibration in tail HELP!!
11-12-2012 04:26 AM  7 years ago
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Ayres_08

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Ardmore,Ok

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Bad Vibration in tail HELP!!

Watch at YouTube

Ive tried just about everything to try and figure out what is causing this. Ive checked gyro, bearings in motor, main shaft, gears... I still cannot figure out what is causing this, although i have figured out a few things to make it vib less. Lowering head speed makes it hoverable, and when i say lower i mean low... also making the engine run lean makes it really bad... Any help is greatly appreciated...
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11-12-2012 04:51 AM  7 years ago
Dave's Raptor

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Utah, USA

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Is this a torque tube drive tail? If so you should check the drive gears and make sure they are fully seated. If they are not it will cause a bad vibration in the heli and it is really noticeable in the tail.

Dave
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11-12-2012 04:52 AM  7 years ago
dkshema

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Cedar Rapids, IA

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Among other things, I'd say your gyro gain is way way way too high.

How is your gyro mounted, is the mounting tape in good condition, or is it loose and floppy?

Where is your gyro mounted? Is the tail rotor shaft bent? Tail rotor hub/grips/blades way out of balance? Bearings in the tail rotor grips shot, properly installed, including the thrust bearings?

More info about your radio, gyro, settings that control the gyro (or the ones you THINK are controlling the gyro), servo, past crash history would be good to have, as well.
-----
Dave

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

Team Heliproz
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11-12-2012 04:20 PM  7 years ago
John Davis

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St. Cloud, Florida - USA

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Almost looks like the whole tail boom is loose. A couple of questions come to mind and please do not be offended by the questions because I do not know how long you have been building or flying heli's. Are the four allens that hold the tail boom in the front housing good and tight? Tail boom seated all the way into housings front and back? Tail rotor blades installed backwards to the rotation of the mains? Bent tail rotor shaft? I know these are fairly simple things to over look but sometimes it happens.
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11-12-2012 06:56 PM  7 years ago
Ayres_08

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Ardmore,Ok

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Dave- Yes i would probably say that there is a little more play than there should be. Ill try that.

John- Yes, Maybe (see above), No, No

Dks- Gyro gain is fine, flew this heli for about 6 months with no problems at all. Just happened all at once for some reason.
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11-13-2012 12:57 AM  7 years ago
gftazz

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upstate N.Y. in the Adirondacks

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Seems as you get up to hover rpm the motor goes lean on ya.
On spool up the motor sounds good but as you get to half throttle and the hover point light on the skids just at lift off the motor goes raspy and lean on ya. What motor is this? It may need to go out 3-4 clicks on the main meedle if it's a 2 needle motor like the OS50. If it's an OS55 with a three needle carb go out 3-4 clicks on the midrange needle and the high needle and see how she sounds and goes and it may need a bit more. Maybe weather change getting cooler denser air so needs to richen up motor some.

Or check for an air leak in the fuel system causing a lean condition after the motor reaches a certain draw point around half hrottle.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!
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11-13-2012 01:02 AM  7 years ago
gftazz

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upstate N.Y. in the Adirondacks

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After watching video again it's the motor going lean causing the tail to jump like that.
It's the motor going lean and raspy at the point of liftoff or hover causing the tail to bounce around like that. You can see the change as soon as the motor isn't smooth anymore at the lift off point needs to be richened up so it stays smooth like the run up to that point as you open the throttle up.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!
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11-13-2012 05:32 AM  7 years ago
John Davis

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St. Cloud, Florida - USA

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Two washout pins have not come up and out of the washout base slots on the main rotor? Everything will appear to be working fine until you go to fly. Pins will be setting outside of the slots on either side of the washout base. Heli can react crazy!
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11-13-2012 05:35 AM  7 years ago
dkshema

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Cedar Rapids, IA

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Bad/dirty feedback potentiometer in the Rudder servo?

Got a chafed wire somewhere, with the insulation rubbed off, contacting stuff it shouldn't?
-----
Dave

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

Team Heliproz
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11-13-2012 10:57 AM  7 years ago
John Davis

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St. Cloud, Florida - USA

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Chaffed wire is a good guess DK, This has caused many heli crashes over the years.

Really does look like something is causing the tail rotor servo to osculate back in forth. Double check all the settings (gain) in your transmitter for the gyro. Might have to try another gyro and/or tail rotor servo.
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11-13-2012 04:49 PM  7 years ago
210338jim

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United Kingdom

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Double check your gyro is stuck down 100% - I had this situation last Sunday when on spooling-up the tail-end seemed to develop a horrendous vibration - one of the more experienced members of the Club went forward (when the blades had stopped) and 'lifted' the gyro - it was being held by only a very narrow strip of the sticky tape - replaced the tape and all was well
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11-22-2012 02:28 AM  7 years ago
Ayres_08

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Ardmore,Ok

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Well I have the heli tore down to nothing. So far I have found bad bearings in main shaft, and mesh was a little loose. As for the tail servo, it is brand new, this was the 2nd flight. As for gas/air ratio I had actually been messing with it once the heli started this. Ive ordered new bearings so ill let you know if thats it...
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11-22-2012 04:51 AM  7 years ago
John Davis

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St. Cloud, Florida - USA

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Did the heli fly okay with no vibrations on the first flight? Did you check for chaffed wires like dkshema recommended? Look up around the clutch housing area and around the starter Shaft. I have seen the wire insulation rubbed off and the bare wire rubbing against the clutch housing or the starter shaft.
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