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  #1  
Old 01-10-2018, 04:47 PM
iwannarv iwannarv is offline
 
Join Date: Aug 2005
Location: Stafford, KS
Posts: 269
Default Rudder Trailing Edge Trim Tab

I am coming up on the step of riveting my rudder trailing edge. I am planning ahead and would like to add a trim tab for future adjustment. Question I have is how large of tab, and what relative location? Asking so I know which rivets I may need to leave open for now to add the tab later in the build.

What have others done?

PS...... I also plan to use the Aerosport spring bias system but was told I may need to use in conjunction with a tab/wedge (would prefer a tab).
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  #2  
Old 01-10-2018, 06:01 PM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 897
Default Why?

Why would you need a tab and the spring bias system?

With the spring bias system, you are moving the ENTIRE rudder to a new center point. The tab/wedge would serve no purpose.

The tab is also adding more complexity to the system. The spring bias is, in comparison, very simple.

I originally looked at doing a tab but settled on the Aerosport system...
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Aerospace Engineer '88

RV-10
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  #3  
Old 01-10-2018, 06:39 PM
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Auburntsts Auburntsts is offline
 
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Location: Dumfries, VA
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Default

You got bad gouge --it's usually one or the other, not both. I have the Aerosport system spring system and it works well. Those that go with the fixed tab tend to epoxy on a wood or plastic wedge in place vs riveting on a metal tab. If you go that route, wait until you are flying then tape different sized wedges on until you find the right size for your plane. Then you can permanently attach it. A third but more complex option would be to install a servo rudder trim system driving a rudder trim tab (overkill IMO, but others will disagree).

FWIW, I flew for almost two years without anything at all. I found that all I needed to to do was rest my right foot on the right rudder pedal in cruise to keep the ball centered, but that started to get old on long X/C flights so I opted for the spring system and haven't looked back.
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Last edited by Auburntsts : 01-10-2018 at 07:10 PM.
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  #4  
Old 01-10-2018, 06:56 PM
iwannarv iwannarv is offline
 
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Location: Stafford, KS
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Default

Thanks.... A riveted metal tab was what I was referring to, not a cut out servo controlled tab as part of the rudder. Will move on and stick with the spring bias only.
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  #5  
Old 01-10-2018, 07:07 PM
bob888 bob888 is offline
 
Join Date: Jul 2012
Location: Fresno, CA
Posts: 198
Default

I have both the Aerosport bias spring system and a fixed tab. I flew with just the Aerosport system for a while but found myself having to crank in a lot of right rudderbias all the time. I subsequently added a fixed tab to the trailing edge of the rudder up high (out of propwash?). It has made use of the Aerosport system more symmetrical, if that makes sense. I think many 10s need a right rudder bias in most flight modes. I would wait until flying...easy to drill out a few rivets and add a rudder tab when/if needed.
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  #6  
Old 01-10-2018, 08:29 PM
iwannarv iwannarv is offline
 
Join Date: Aug 2005
Location: Stafford, KS
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Default

Quote:
Originally Posted by bob888 View Post
I have both the Aerosport bias spring system and a fixed tab. I flew with just the Aerosport system for a while but found myself having to crank in a lot of right rudderbias all the time. I subsequently added a fixed tab to the trailing edge of the rudder up high (out of propwash?). It has made use of the Aerosport system more symmetrical, if that makes sense. I think many 10s need a right rudder bias in most flight modes. I would wait until flying...easy to drill out a few rivets and add a rudder tab when/if needed.
I agree this is what I was told previously, with the need to have both, possibly. Will wait till flight.
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  #7  
Old 01-10-2018, 09:00 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Uh...

I would be curious to hear the reasoning behind having both.

From an aerodynamic standpoint, it doesn't make any sense. The fixed tab is used to create a new center point for the rudder by moving the rudder.

The spring bias system creates a new center point by moving the rudder.

If you need to add a tab to gain more rudder authority, then you probably have insufficient tension on the trim springs.

If you are using the tab to reduce rudder authority, then you are defeating the purpose of the rudder bias system.

So what would be the reasoning behind having both?

This is for the sake of discussion only. Each of us is building a custom machine and is free to do and try whatever they so desire.
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful

Dues Paid 2017,...Thanks DR+
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  #8  
Old 01-10-2018, 09:44 PM
redbaron redbaron is offline
 
Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 214
Smile Rudder trim tab

Vans has a nice rudder trip kit. nice and very low cost. give them a call
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  #9  
Old 01-11-2018, 05:23 AM
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Auburntsts Auburntsts is offline
 
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Default

Quote:
Originally Posted by redbaron View Post
Vans has a nice rudder trip kit. nice and very low cost. give them a call
Really? Is it listed on their website?
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  #10  
Old 01-11-2018, 08:03 AM
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Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,068
Default a further thought

I was all settled on the AeroSport spring bias system until I heard about the yaw damper option being included in AFS/Dynon offerings. Fuselage now fitted with yaw damper servo mounting hardware as I plan to go that route.

Hoping that a small fixed tab is all I might ever need to add to the yaw damper setup, even knowing the servo isn't meant to supply constant trim bias - but I believe it can contribute some.

Any reports from the field on going this route?
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