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

[Andreas Christou]

Interesting how the same problem, yields the same solution! I came up with 
the very same idea which has been shown here on my "new" website. Funny how 
they all look axactly the same. http://x-jets.com/elevator_bearings.html


Andreas



At 11:10 PM 10/6/04, KeithHallsten wrote:
>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: <mailto:ALVentures at cox.net>Al Gietzen
>To: <mailto:reflector at tvbf.org>'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
>
>
>
>
>----------
>_______________________________________________
>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