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  #1  
Old 01-27-2021, 11:49 AM
Russell Hilton Russell Hilton is offline
 
Join Date: Nov 2020
Location: Summerville, SC
Posts: 6
Default Hinge Placement of Electric Rudder Trim

I'm getting ready to start the empennage kit and I am going to add the electric rudder trim that many have done with the section cut from the rudder. Like this one done by Brian Steeves. I've studied all the posts and many pictures taken of other builds and there seems to be no consensus as to the hinge placement side or the side that the servo control rod is placed.

It seems to me that if you normally use right rudder, thus requiring the trim tab to swing to the left (pilot side) of the plane, that the most logical placement would be to put the hinge on the right (co-pilot) side which would minimize the gap on the pilot side as the tab moves leftward. Likewise, placing the servo control arm on the opposite side of the hinge would slow the travel and create more leverage for the servo to operate.

Is there a consensus to this, am I thinking about it correctly or am I missing something?
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  #2  
Old 01-27-2021, 12:38 PM
arr arr is offline
 
Join Date: Jun 2020
Location: Fresno
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Hey Russell,

Great questions! I was thinking along the same lines when I was entertaining the thought of having the electric trim.

Then I decided to leave the rudder integrity alone and perhaps place an internal system.

I am watching to see where this question leads.

Andy
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  #3  
Old 01-27-2021, 02:51 PM
arr arr is offline
 
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By the way, still contemplating adding this feature.

by the looks of the wait time on the fuselage I'll probably have plenty of time to mess around with such things.
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Thanks to a COVID forced shutdown--re-evaluated and completing a 40 yr dream of flying and building.

Nearing completion of tail cone. Feathers mounted and dialed in. Starting the specialty of fiberglass.

Passed the written. Check ride soon.
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  #4  
Old 01-28-2021, 08:52 AM
Russell Hilton Russell Hilton is offline
 
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Location: Summerville, SC
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Andy,

I've done quite a bit of research and thinking about it. Sometimes phones will flip pictures so it can be hard to really tell if it's the left side or right side that people are using. Either way, I guess I'll figure it out at some point.

Russ
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Old 01-28-2021, 09:47 AM
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Plummit Plummit is offline
 
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I'll have to look at mine. The trim motor and linkage is on the left side of the rudder/VS when viewed from the rear. I'll check where the hinge is today. From the pic it looks like the builder centered it.

-Marc
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  #6  
Old 01-28-2021, 10:24 AM
Russell Hilton Russell Hilton is offline
 
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Marc,

I thought about centering the hinge as an option as well. I'll be interested to see if that's how yours is.

Russ
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  #7  
Old 01-28-2021, 10:55 AM
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9GT 9GT is offline
 
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I just attached a extruded aluminum hinge to the trailing edge of my rudder with a SS L bracket riveted to the trim half of the hinge. Maybe about 8 long IIRC. The servo was mounted inside the rudder on an access panel and the push rod had a custom fairing. Very simple and I used it quite a bit to avoid using rudder pedal pressure to keep the ball centered.
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  #8  
Old 01-28-2021, 02:55 PM
PCHunt PCHunt is offline
 
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Quote:
Originally Posted by 9GT View Post
I just attached a extruded aluminum hinge to the trailing edge of my rudder with a SS L bracket riveted to the trim half of the hinge. Maybe about 8 long IIRC. The servo was mounted inside the rudder on an access panel and the push rod had a custom fairing. Very simple and I used it quite a bit to avoid using rudder pedal pressure to keep the ball centered.
Would you be able to post a photo, or a link to a photo of your trim tab?
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  #9  
Old 01-28-2021, 04:48 PM
greghale greghale is offline
 
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Location: TULSA, OK
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Default rudder trim

I used the extruded hinge method and it works perfectly. I use it all the time - 800 hours. This link will take you to my web page.
http://www.nwacaptain.com/rudder_trim.html
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  #10  
Old 01-28-2021, 04:57 PM
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9GT 9GT is offline
 
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Quote:
Originally Posted by PCHunt View Post
Would you be able to post a photo, or a link to a photo of your trim tab?
I don't have any photos handy right now, but it was exactly as shown in Greg's (greghale) post.
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RV-10: #41686 Under Construction
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Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2021
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