REFLECTOR: Elevator torque tube center bearings(Was:FrontVibration90% resolved)

[Tom Martino]

I made the same modification.  The advantage is that the bearings make up for any tiny deviations in alignment of the torque tubes and make for a smoother stroke on the stick and smoother motion on the elevators.  It also puts the bearing surface farther into the torque tube ends ... eliminating the possibility of the torque tube ends slipping off  of the center attach bracket.  
 
 
-----Original Message-----
From: Douglas Holub [mailto:doug.holub at comcast.net] 
Sent: Thursday, October 07, 2004 9:10 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Elevator torque tube centerbearings(Was:FrontVibration90% resolved)
 
What's the advantage, again?
	----- Original Message ----- 
	From: KeithHallsten <mailto:KeithHallsten at quiknet.com>  
	To: Velocity Aircraft Owners and Builders list <mailto:reflector at tvbf.org>  
	Sent: Wednesday, October 06, 2004 10:10 PM
	Subject: Re: REFLECTOR: Elevator torque tube centerbearings(Was:FrontVibration 90% resolved)
	 
	That's exactly the same mod I incorporated.  I recommend it extremely highly; I think it should be the standard design for all Velocities.  I got the bearings from Aircraft Spruce - part #KSP4.  They were about $20 each when I bought them in 2001.  I used an AN4 bolt, but I don't remember now whether it was a -16 or a -17.  I used large washers (washer OD just a bit smaller than the bearing OD) on both sides of both bearings; in the extremely unlikely event of bearing failure, the washer ODs would become a temporary bearing surface.
	 
	Keith Hallsten
	 
		----- Original Message ----- 
		From: Al Gietzen <mailto:ALVentures at cox.net>  
		To: 'Velocity Aircraft Owners and Builders list' <mailto:reflector at tvbf.org>  
		Sent: Tuesday, October 05, 2004 9:25 PM
		Subject: RE: REFLECTOR: Elevator torque tube center bearings(Was:FrontVibration 90% resolved)
		 
		 
		Tony;
		 
		I installed ball bearings that slide inside the torque tube. The bearings mount to the center pivot support with a ¼"bolt.  The bearings are from Aircraft Spruce.  It has been years since I have done the mod so I don't have the bearing #, but it is ¼" i.d.; and the nearest o.d. to the inside tube dimension.  I recall having to ream the tube i.d. just a bit.  Be sure to get a "self centering" bearing where the outer race can move relative to shaft alignment because the TT has to slide over at a bit of an angle when installing.  It makes a strong, smooth pivot. Old photo attached.
		 
		I left the TT as long as possible, and cut it back around 180 degrees to give clearance from the support to give as much insertion into the tube as possible.  Photo attached.
		 
		It may be that I also bought a "full dimension" bolt (.250" diameter) to fit snugly to the bearing i.d.
		 
		Al
		 
		 
		Subject: Re: REFLECTOR: Elevator torque tube center bearings (Was:FrontVibration 90% resolved)
		 
		Tony Babb wrote:
		 
		> I'll be doing my elevators shortly. I've watched the video multiple 
		> times but can't visualize this design improvement. Are there any 
		> photos available?
		>  
		> Thanks
		>  
		> Tony
		> SEFG
		 
		
  _____  

		_______________________________________________
		To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
		
		Visit the gallery!  www.tvbf.org/gallery
		user:pw = tvbf:jamaicangoose
		Check new archives: www.tvbf.org/pipermail
		Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
	
  _____  

	_______________________________________________
	To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
	
	Visit the gallery!  www.tvbf.org/gallery
	user:pw = tvbf:jamaicangoose
	Check new archives: www.tvbf.org/pipermail
	Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20041007/875186b3/attachment.html