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Rudder Trim and Rudder Counter-Balance

 
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s51flyer(at)wi.rr.com
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PostPosted: Mon Feb 13, 2017 5:22 pm    Post subject: Rudder Trim and Rudder Counter-Balance Reply with quote

Has anyone that has added rudder trim had to add any weight to the rudder counter balance? I cut a tab into the rudder as some builders have done vs. adding a hinge to the trailing edge. The weight difference is probably similar, except for maybe a bit more epoxy work to seal up the rudder tab edges.

Not sure how tight the tolerance is on the counter weight and whether it's anything to worry about.

Thanks in advance.

Bob Orre...

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carl.froehlich(at)verizon
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PostPosted: Mon Feb 13, 2017 6:21 pm    Post subject: Rudder Trim and Rudder Counter-Balance Reply with quote

This is a simple and effective rudder trim tab (not my idea - stole it).
Trim the tab as needed to get the ball in the center in cruise. Hard to see
but the tab has a ~30 degree bend aft. No added rudder counter balance
weight.

I started out with the ball touching the left line. Now it is in the
center.

Do this only after you are double check that your gear leg fairing are not
the cause of your ball being out.

Carl

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Kellym



Joined: 10 Jan 2006
Posts: 1389
Location: Sun Lakes AZ

PostPosted: Mon Feb 13, 2017 7:32 pm    Post subject: Rudder Trim and Rudder Counter-Balance Reply with quote

The finish documents give the tolerance for rudder and other control
surface balance.

On 2/13/2017 6:22 PM, Outlook wrote:
Quote:


Has anyone that has added rudder trim had to add any weight to the rudder counter balance? I cut a tab into the rudder as some builders have done vs. adding a hinge to the trailing edge. The weight difference is probably similar, except for maybe a bit more epoxy work to seal up the rudder tab edges.

Not sure how tight the tolerance is on the counter weight and whether it's anything to worry about.

Thanks in advance.

Bob Orre...

Sent from my iPad




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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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s51flyer(at)wi.rr.com
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PostPosted: Fri Feb 17, 2017 6:05 pm    Post subject: Rudder Trim and Rudder Counter-Balance Reply with quote

Contacted Van's and they provided the finish tolerance. I'm familiar with different methods of static balancing, including measuring the weight of the trailing edge, etc., but I don't understand how to use the data they gave me.

Finish documents say the rudder’s balance limit is 30.8 in-lb’s. This is probably simple, and I am over-thinking it. However, I’m not quite sure how to apply the 30.8 in-lb. number in measuring the rudder balance.

Any insight is appreciated.

Tks, Bob…
[img]cid:image002.png(at)01D28958.576A7E50[/img]

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Kellym



Joined: 10 Jan 2006
Posts: 1389
Location: Sun Lakes AZ

PostPosted: Fri Feb 17, 2017 6:17 pm    Post subject: Rudder Trim and Rudder Counter-Balance Reply with quote

You are just measuring the trailing edge force when suspended on knife
edge at hinge points. Force times the distance from hinge point to
trailing edge gives you the inch pounds.

On 2/17/2017 7:04 PM, Bob Orre wrote:
[quote] Contacted Van's and they provided the finish tolerance. I'm familiar
with different methods of static balancing, including measuring the
weight of the trailing edge, etc., but I don't understand how to use the
data they gave me.

Finish documents say the rudder’s balance limit is 30.8 in-lb’s. This
is probably simple, and I am over-thinking it. However, I’m not quite
sure how to apply the 30.8 in-lb. number in measuring the rudder balance.

Any insight is appreciated.

Tks, Bob…

--


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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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s51flyer(at)wi.rr.com
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PostPosted: Fri Feb 17, 2017 6:57 pm    Post subject: Rudder Trim and Rudder Counter-Balance Reply with quote

Thanks, Kelly. I was over-thinking it.

Bob...

Sent from my iPad

[quote] On Feb 17, 2017, at 8:18 PM, Kelly McMullen <kellym(at)aviating.com> wrote:



You are just measuring the trailing edge force when suspended on knife edge at hinge points. Force times the distance from hinge point to trailing edge gives you the inch pounds.

> On 2/17/2017 7:04 PM, Bob Orre wrote:
> Contacted Van's and they provided the finish tolerance. I'm familiar
> with different methods of static balancing, including measuring the
> weight of the trailing edge, etc., but I don't understand how to use the
> data they gave me.
>
>
>
> Finish documents say the rudder’s balance limit is 30.8 in-lb’s. This
> is probably simple, and I am over-thinking it. However, I’m not quite
> sure how to apply the 30.8 in-lb. number in measuring the rudder balance.
>
>
>
> Any insight is appreciated.
>
>
>
> Tks, Bob…
>
>
>
> --


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