REFLECTOR: Elevator torque tube center bearings(Was:FrontVibration 90% resolved)

[KeithHallsten]

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 
  To: 'Velocity Aircraft Owners and Builders list' 
  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





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