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  #1  
Old 04-03-2021, 06:05 PM
craig.roser's Avatar
craig.roser craig.roser is offline
 
Join Date: Feb 2019
Location: BRADENTON
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Default Rudder trim tab

New to me RV8 needs a half ball trim. What's the elegant solution?
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  #2  
Old 04-03-2021, 06:58 PM
ScottK ScottK is offline
 
Join Date: Feb 2007
Location: SLC, UT
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I know some builders have added a rudder trim tab and servo, but probably not practical on a finished rudder and possibly a good way to get into an argument. There's also a doohickey (https://www.aerosportproducts.com/product/rudder-trim/) that goes under the panel.
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  #3  
Old 04-03-2021, 07:56 PM
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Tankerpilot75 Tankerpilot75 is offline
 
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Hereís a very simple solution that allows you to experiment on how much trim tab you need. https://www.cleavelandtool.com/products/rudder-trim-tab

Fly it with double sided tap until you define how much to shorten the tab and where best to place it. Once youíve identified your trim tab needed size and location you can choose a more permanent attachment. Itís also easy to paint.

I use this as a aileron tab to help balance a heavy wing after trying just about everything else. It works great and frankly Iím still using double sided tape.
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  #4  
Old 04-04-2021, 06:07 AM
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craig.roser craig.roser is offline
 
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I just ordered the wedge. I am a half ball out. Do you recall how far out you were and how long you settled on?
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  #5  
Old 04-04-2021, 08:13 AM
g zero g zero is offline
 
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Location: palm coast fl.
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Default Rudder Trim

Simple Solution....
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  #6  
Old 04-04-2021, 08:22 AM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by craig.roser View Post
New to me RV8 needs a half ball trim. What's the elegant solution?
First make sure you are not putting a bandaid on a rigging issue. Fly with the wheel pants off. Ball still out? Do you have a heavy wing?

Then take small steps for rudder trim. The photo of the small rudder tab on the tail light will take care of perhaps half of your issue and is not permanent.

Carl
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  #7  
Old 04-05-2021, 04:09 AM
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craig.roser craig.roser is offline
 
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Pray tell, how do I tell if I have a heavy wing? Scales on the ground equal fuel? I am not the builder. The plane flies great and straight just laying a toe on the right rudder pedal.

Never thought about wheel pants off either. Is that a common touch point?
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  #8  
Old 04-05-2021, 06:55 AM
g zero g zero is offline
 
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Default Rudder trim

I personally would not chase a simple problem that has such an easy fix . Put a trim tab on it and be done . Iíve yet to see an airplane without one . My solution has served me well and is Permanent to me .
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  #9  
Old 04-05-2021, 07:49 AM
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longranger longranger is offline
 
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Quote:
Originally Posted by craig.roser View Post
Pray tell, how do I tell if I have a heavy wing? Scales on the ground equal fuel? I am not the builder. The plane flies great and straight just laying a toe on the right rudder pedal.

Never thought about wheel pants off either. Is that a common touch point?
ďHeavy wingĒ is just pilot jargon for hands-off turning tendency. If youíre happy with the way your airplane flies you donít need to do anything.
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  #10  
Old 04-05-2021, 07:50 AM
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Jpm757 Jpm757 is offline
 
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I have installed rudder pedal return springs on my -6 and -7. Differential tension on the springs can be used to trim the rudder for cruise flight. Also keeps the rudder cables taught when on the ground.
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