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  #1  
Old 02-27-2014, 09:23 AM
Rocky005 Rocky005 is offline
 
Join Date: Jan 2013
Location: Perth, Western Australia
Posts: 35
Default Rudder Asymmetry

We have finished our RV-14 rudder as per VAN's plans. Our trailing edge is bonded with 3M adhesive tape, riveted and it is nice and straight.
One side of the rudder now sits flat on the workbench but if we turn our rudder over it has a twist of about 20mm causing it to rock.

Please post how your RV-14 rudder sits with each side up (ie flat) when on a level workbench? Does anyone else see a twist on one side of their rudder?


This may not affect our rudders performance. Thoughts?
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  #2  
Old 02-27-2014, 09:38 AM
DaAV8R DaAV8R is offline
 
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Location: Lee's Summit, MO
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Default Twist

I don't see how one side could be twisted and not the other side. Sounds to me like your bench is twisted also.
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  #3  
Old 02-27-2014, 10:01 AM
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ppilotmike ppilotmike is offline
 
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Location: Denver, CO
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Default +1

Quote:
Originally Posted by DaAV8R View Post
I don't see how one side could be twisted and not the other side. Sounds to me like your bench is twisted also.
Check the bench again.
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  #4  
Old 02-27-2014, 10:54 AM
kaber56 kaber56 is offline
 
Join Date: Nov 2012
Location: Fairview Park, OH
Posts: 25
Default

Its supposed to be! I believe the rudder spar is wider at the base then at the top, it tapers.
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  #5  
Old 02-28-2014, 09:25 AM
Rocky005 Rocky005 is offline
 
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Location: Perth, Western Australia
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Default

Quote:
Originally Posted by kaber56 View Post
Its supposed to be! I believe the rudder spar is wider at the base then at the top, it tapers.
Yes you are right the rudder spar or front trailing edge is tapered. But shouldn't both sides rock by 10mm (ie symmetrical), rather then like ours were one side is flat and one side has a 20mm rock.

Its not the bench sorry.
Would love a response from someone with the rudder riveted, thanks.
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  #6  
Old 02-28-2014, 12:34 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,641
Default

You are correct.
Neither side of the rudder should be able to lay flat, on a flat surface.
It sounds like your rudder has a twist in it.
Did you have it weighted down flat on one side when you riveted the trailing edge?
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  #7  
Old 02-28-2014, 01:09 PM
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SeanB SeanB is offline
 
Join Date: Dec 2006
Location: Colorado Springs
Posts: 540
Default Me too!!!

Interesting. I used a granite counter top (very flat) and lots of weight when bonding the trailing edge of my RV7 rudder and ended up with the same result. It is very straight on the trailing edge, lays down flush with the counter top on one side. Flip it over, and it hovers above the counter top. Seems it go flattened past the center point of the rudder during bonding.???

Is this useable or do it again?

Thanks,
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  #8  
Old 02-28-2014, 01:21 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,143
Default Old School Alignment Tool

This might be something where a lesson from the past would be helpful. Here's the rudder assembly jig for my RV-3B, built per the plans and the manual.

The two Vee cuts were carefully aligned. Notice that I've got the base clamped down. It was shimmed so the centerline of the two Vee cuts were parallel and clamped securely. If you look closely, you can see a shim at the lower right corner of the photo.

Besides the leading edge, the skin to spar joint was drilled and riveted in this jig.



Dave
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  #9  
Old 02-28-2014, 01:32 PM
DaAV8R DaAV8R is offline
 
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Location: Lee's Summit, MO
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Default Rudder

It has been awhile since I've had my -8 rudder on the table. It currently hangs high on the wall. Are the sides of these rudders not flat? Just because the surface tapers both top to bottom and front to back does not mean the surface isn't flat. If the surface is flat it seems like it should flat of the table.

Maybe I'm not remembering this correctly.
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1946 Cessna 120
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  #10  
Old 02-28-2014, 01:48 PM
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ppilotmike ppilotmike is offline
 
Join Date: Jan 2010
Location: Denver, CO
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Default

Quote:
Originally Posted by DaAV8R View Post
It has been awhile since I've had my -8 rudder on the table. It currently hangs high on the wall. Are the sides of these rudders not flat? Just because the surface tapers both top to bottom and front to back does not mean the surface isn't flat. If the surface is flat it seems like it should flat of the table.

Maybe I'm not remembering this correctly.
My sentiments exactly. I built my RV10 rudder on a flat bench, with the trailing edge clecoed into a steel angle to maintain straightness while the proseal cured. Then I double flush riveted per Vans instructions. Both sides of my rudder lie flat on my table.
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EAA Chapter 301 www.eaa301.org
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RV-10 Working on the "Dreaded Doors"
http://www.mykitlog.com/users/index....ig&project=803
F-14 (Pedal Plane - Daughter's Project) "Flying"
https://www.youtube.com/watch?v=zKCyX2FXrlw
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