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Gscott · 12-05-2012, 07:54 AM

I have been having an issue with my x50 that I can't track down. The tail makes a loud buzzing under load. I have tried numerous tail blades and even mounted an Align v2 hub and grips but the issue still persists. Today I noticed play with the rear input gear assembly in the tail case. I can move the gear in and out about 1mm and I can also spin the bearing in the tail case. I disassembled the tail tonight and noticed the bearings and spacer for the input bevel gear are not a tight fit in the tail case. Anyone else have this issue? How tight should the bearings and spacer fit in the tail case?

tr911 · 12-05-2012, 08:46 AM

It sounds like the drive shaft is fluttering. Check your bearing placement and may be even add another bearing to the shaft.

Elgyn · 12-05-2012, 11:59 PM

Mine had a similar probem then I heard that the X50's have insufficient torque tube support so I did the double bearing up grade almost right away. Never had a probelm since

dede60 · 02-10-2014, 07:52 AM

Hi! I have the same problem that you and I would like to know if a washer 6x10x1.0 will help to fix the problem or if it's too big?

jinxjx · 02-10-2014, 02:45 PM

hi there, have a look at this if you haven't already....Post #30....might help....and also the 2nd link......

https://www.helifreak.com/showthread...ht=torque+tube

https://www.helifreak.com/showthread...ht=start+shaft

skytrekin · 02-11-2014, 08:51 PM

If you read my posts in this thread you can see where I had to remove some of the start shaft length as it was rubbing on the crankshaft. Pictures included.

https://www.helifreak.com/showthread.php?t=568841

The X50 is a great flying heli, with some of these things to check you can avoid some of the issues people sometimes have.

Rob43 · 02-15-2014, 08:45 PM

I've had tail buzzing before in my other helis. I had noticed it after touching tail blades in the grass. It turned out to be a bent tail hub in my case. I was unable to see the deformation, but swapping it out came from the advice of a friend who knew of this. Sure enough...quiet and smooth once I swapped it out. If you bumped the tail in a landing, it's worth investigating.

12-05-2012, 07:54 AM	#1 (permalink)
Gscott Registered Users Join Date: Jul 2005 Location: Grove City, OH	X50 tail buzzing I have been having an issue with my x50 that I can't track down. The tail makes a loud buzzing under load. I have tried numerous tail blades and even mounted an Align v2 hub and grips but the issue still persists. Today I noticed play with the rear input gear assembly in the tail case. I can move the gear in and out about 1mm and I can also spin the bearing in the tail case. I disassembled the tail tonight and noticed the bearings and spacer for the input bevel gear are not a tight fit in the tail case. Anyone else have this issue? How tight should the bearings and spacer fit in the tail case?

12-05-2012, 08:46 AM	#2 (permalink)
tr911 Registered Users Join Date: Sep 2010	It sounds like the drive shaft is fluttering. Check your bearing placement and may be even add another bearing to the shaft. __________________ Titan x50 FBL, R50 Titan SE FBL, R50 V2, R30 V2 , Trex500, T-Rex 450x2, mCPx X2,

12-05-2012, 11:59 PM	#3 (permalink)
Elgyn Registered Users Join Date: Jul 2011	Mine had a similar probem then I heard that the X50's have insufficient torque tube support so I did the double bearing up grade almost right away. Never had a probelm since __________________ TT titan x50 / TT mini titan / JR Vigor CV... ...vbar'd / 700 airwolf streched JR Voyager mechanics / JR Venture CP

02-15-2014, 08:45 PM	#7 (permalink)
Rob43 Registered Users Join Date: Oct 2008 Location: Midland, Michigan	I've had tail buzzing before in my other helis. I had noticed it after touching tail blades in the grass. It turned out to be a bent tail hub in my case. I was unable to see the deformation, but swapping it out came from the advice of a friend who knew of this. Sure enough...quiet and smooth once I swapped it out. If you bumped the tail in a landing, it's worth investigating. __________________ = Rb43 =

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02-10-2014, 07:52 AM	#4 (permalink)
dede60 Registered Users Join Date: Sep 2009	Hi! I have the same problem that you and I would like to know if a washer 6x10x1.0 will help to fix the problem or if it's too big?

02-10-2014, 02:45 PM	#5 (permalink)
jinxjx Registered Users Join Date: Dec 2007	hi there, have a look at this if you haven't already....Post #30....might help....and also the 2nd link...... https://www.helifreak.com/showthread...ht=torque+tube https://www.helifreak.com/showthread...ht=start+shaft

02-11-2014, 08:51 PM	#6 (permalink)
skytrekin Registered Users Join Date: Sep 2006	If you read my posts in this thread you can see where I had to remove some of the start shaft length as it was rubbing on the crankshaft. Pictures included. https://www.helifreak.com/showthread.php?t=568841 The X50 is a great flying heli, with some of these things to check you can avoid some of the issues people sometimes have.

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