REFLECTOR: Elevator torque tube centerbearings(Was:FrontVibration90% resolved)

[Al Gietzen]

To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Elevator torque tube
centerbearings(Was:FrontVibration90% resolved)

 

What's the advantage, again?

 

Stronger, smoother, and less friction come to mind.  I decided that a
less-than-perfectly-round steel tube running in an aluminum block didn’t
represent the best bearing design, and I could envision the possibility of
galling.  But the loads aren’t huge, and it may be OK if kept lubed.

 

Al

----- Original Message ----- 

From: KeithHallsten <mailto:KeithHallsten at quiknet.com>  

To: Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders list 

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 <mailto:reflector at tvbf.org>  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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