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  #1  
Old 03-16-2014, 07:19 PM
Michael Burbidge Michael Burbidge is offline
 
Join Date: May 2006
Location: Sammamish, WA
Posts: 552
Default Discouraged–Rudder Binding

I spent the first full day after moving to the hangar yesterday trying to accomplish one thing: mount the rudder. I thought it would take me an hour at most. It turns out I spent the whole day on it and still don't have a completely free moving rudder.

I had followed the directions when mounting the HS many months ago to make sure the brackets on the stab are aligned. I can run a straight edge along them and they are in line. I had also followed the measurement for the rod end bearings in the directions as starting point. The space between the rudder and the HS at the top is parallel.

I'm to the point where bolts can be dropped into each bearing easily. So that tells me the bearings are aligned with the brackets. Getting the bearings into the brackets is a wrestle.

After installing all three bolts and tightening them down, the rudder does not swing freely. I tried lots of stuff.

I have determined that the top two nuts can be tightened and the rudder swings freely. But as soon as I put the last little tightening twist on the bottom nut, it no longer swings freely.

I removed the center bolt, and have the same problem between the top and bottom bolts. With just the top and bottom bolts installed and nuts tightened, it does not swing freely.

I found that by putting a thin washer in the following two places, it almost eliminates the drag, but not quite. 1) Top rod bearing - between the top half bracket and the rod end bearing 2) Bottom rod bearing - between the bottom half bracket and the rod end bearing.

It seems like the problem is with the bottom bearing. I can hear the bottom bearing make a slight noise as the rudder stops swinging, going from dynamic friction to static friction that stops it.

Is it possible that the bearing is bad. I can move the ball smoothly with my hand.

I'm very discouraged and not sure what to try next. I was going to order a spacer from McMaster's just a little bigger than a thin washer and see if it gets better with that in the place of the thin washers.

Suggestions welcomed!
Michael-
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Sammamish, WA
RV-9A Flying–210 hours so far!
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  #2  
Old 03-16-2014, 07:35 PM
Kahuna's Avatar
Kahuna Kahuna is offline
Whelen LED Light Man
 
Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,355
Default

Don't be discouraged. You have come a long way. If I read your post correctly, bolts drop in nicely, or with a little persuasion. But once tightened your feeling binding? Have you tried any LPS bearing lubricant? Are the receivers parallel to the bearing? Its not unusual to have to tweak these a bit. You can also grease them.
Nice video here.
http://www.eaavideo.org/video.aspx?v=1628410977001

Last edited by Kahuna : 03-16-2014 at 07:39 PM.
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  #3  
Old 03-16-2014, 08:03 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,436
Default rod end greasing tool

Does anyone know where to buy that rod end greaser tool?

Bevan
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RV7A Flying!
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
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Grand Rapids EFIS
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  #4  
Old 03-16-2014, 08:08 PM
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Kahuna Kahuna is offline
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Location: Gold Hill, NC25
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Quote:
Originally Posted by Bevan View Post
Does anyone know where to buy that rod end greaser tool?

Bevan
Yep.
http://www.aircraftspruce.com/catalo...sregreaser.php

And in case the product moves around. Its an ACS BEARING REGREASERS
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  #5  
Old 03-16-2014, 08:26 PM
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AF_Alan AF_Alan is offline
 
Join Date: Jul 2007
Location: Eugene, OR
Posts: 122
Default Not aligned or rivet heads

I had two similar issues with initial control surface fitting:

1. Brackets for bearings aren't truly aligned. Dimensions to adjust rod bearings in plans are the starting point. I'd adjust the bottom bearing 1/2 turn inward and re-tighten. If that doesn't fix it, try another 1/2 turn. Still not fixed, then return to start and try 1/2 turn and/or full turn out. Don't back it out so far that minimum threads aren't engaged.

2. After paint, I got resistance at full deflection which ended up being nose of surface rubbing on rivet heads in stab. Backed all bearings out 1/2 turn to remain aligned but further from stab and problem gone. (trying to flex the nose into a more round shape to clear rivets didn't help in my case).

Good luck
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RV-9A N984AW
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  #6  
Old 03-16-2014, 08:34 PM
Bevan Bevan is offline
 
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Location: BC
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Default

Thanks! I had searched many key words at ACS but never found them.

Bevan.


Quote:
Originally Posted by Kahuna View Post
Yep.
http://www.aircraftspruce.com/catalo...sregreaser.php

And in case the product moves around. Its an ACS BEARING REGREASERS
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RV7A Flying!
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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  #7  
Old 03-16-2014, 08:37 PM
Michael Burbidge Michael Burbidge is offline
 
Join Date: May 2006
Location: Sammamish, WA
Posts: 552
Default LPS Bearing Lubricant...

Kahuna,

Is this the LPS lubricant you're talking about?

http://www.aircraftspruce.com/catalo...lickkey=448322

Michael-
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  #8  
Old 03-16-2014, 10:56 PM
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jcaplins jcaplins is offline
 
Join Date: Feb 2006
Location: Davis, CA, USA
Posts: 450
Default

Quote:
Originally Posted by Kahuna View Post
Yep.
http://www.aircraftspruce.com/catalo...sregreaser.php

And in case the product moves around. Its an ACS BEARING REGREASERS


Any idea what sizes our RV's need? (without me having to run out to the hangar and measure)


Thanks,
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California
track me (actually, don't bother. It's not going anywhere) KB3AWW
RV7 N76CX
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  #9  
Old 03-17-2014, 12:52 AM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 8,863
Smile

Try this simple test first.

Shine a flashlight upwards from the bottom hinge through the three holes as you look down through the top hinge hole. You will soon see how well aligned the holes are.

Do this separately on both the rudder and the fin hinge holes.
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Half completed RV-10 QB purchased
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  #10  
Old 03-17-2014, 09:36 AM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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Default

A laser lite may work too.
Tom
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Teflon Hose Assemblies for Experimentals
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