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Rudder Trim Question

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Bldgrv10450(at)comcast.ne
Guest

Posted: Wed May 14, 2008 6:21 am Post subject: Rudder Trim Question

My friend John Hilger in Bend Or. sent an  email suggesting that we should come up with an addition to the rudder  pedal system we have designed. Thanks to John we are  now considering two optional features. First, a gust lock that will work  for the pedals and stick, and the second an effective servo adjustable  rudder trim. We have two concepts under consideration, however we need some help  from flying RV10's.

  

 We need to determine the amount of pedal  pressure required by a clean rudder without trim tab in level flight.  We are assuming 3 to 5 lbs. How can this be measured?

  

 Thanks in advance for your help.

  

 Paul Grimstad

 RV10  40450

 Portland, Or.

  

 [quote]   ---

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planesmith(at)hotmail.com
Guest

Posted: Wed May 14, 2008 7:04 am Post subject: Rudder Trim Question

Hi Paul,

  

 It was great meeting you last Saturday. While not yet flying the following email excerpt may help. 

 Vern Smith (#324 finishing)

  

 What trim force do you think you are getting?  I had sent an e-mail to Vans asking what input they thought would be required.  They told me that a 5 to 10 pound force as measured at the bottom of the rudder pedal should take care of any 'normal' trim, 25 pounds could be required to compensate for takeoff forces.

 

I have been crunching numbers on the torsion spring bias system that I had designed.  I am having difficulty getting the required trim force without overloading the trim servo motor, or limiting the travel too much.  A combination of the two systems may be just the ticket to realize the benefits of both.

 

Again I really like the different approach, thanks for sharing.

 

Jason Kreidler - #40617

4 Partner Build - Finishing







 [quote]  From: Bldgrv10450(at)comcast.net

To: rv10-list(at)matronics.com

Subject: RV10-List: Rudder Trim Question

Date: Wed, 14 May 2008 07:16:27 -0700



     My friend John Hilger in Bend Or. sent an email suggesting that we should come up with an addition to the rudder pedal system we have designed. Thanks to John we are now considering two optional features. First, a gust lock that will work for the pedals and stick, and the second an effective servo adjustable rudder trim. We have two concepts under consideration, however we need some help from flying RV10's.

  

 We need to determine the amount of pedal pressure required by a clean rudder without trim tab in level flight. We are assuming 3 to 5 lbs. How can this be measured?

  

 Thanks in advance for your help.

  

 Paul Grimstad

 RV10  40450

 Portland, Or.

  

 [quote] ---

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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ricksked(at)embarqmail.co
Guest

Posted: Wed May 14, 2008 7:48 am Post subject: Rudder Trim Question

Hey Paul....It's Two foot punds right?   one on each pedal?    

Rick Sked 

40185 

  

do not archive

---

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billderou(at)yahoo.com
Guest

Posted: Wed May 14, 2008 8:16 am Post subject: Rudder Trim Question

Paul-

I would suggest that you keep the clamping rudder trim concept on the table and compare it with a servo setup. It works very well and you can easily design it with a breakaway force allowing override from the pedals. I can get away with a "personal" big screw setup that has an "iffy" override but to be offered to the general public it must have the override feature.



The obvious advantage is the clamping approach is simplier with less expensive manufacturers cost. The not so apparent advantage is it fuctions with much less force.



A servo implementation needs force to move the rudder and overcome friction in the cable system. The clamping design uses the friction to help hold the rudder. Difference in forces required is two times the friction. 



I can see where the gust lock fits well with the pedals but its a little harder to visualize the rudder trim. If you want to spin the rudder trim off as a seperate product take a look at the work I have  accomplished. It needs a few more parts to add a breakaway feature and I think a builder would rather buy than build.



Good Luck,

Bill DeRouchey

N939SB, flying





Paul Grimstad <Bldgrv10450(at)comcast.net> wrote:[quote]NW Builder Dinner       My friend John Hilger in Bend Or. sent an  email suggesting that we should come up with an addition to the rudder  pedal system we have designed. Thanks to John we are  now considering two optional features. First, a gust lock that will work  for the pedals and stick, and the second an effective servo adjustable  rudder trim. We have two concepts under  consideration, however we need some help  from flying RV10's.

  

 We need to determine the amount of pedal  pressure required by a clean rudder without trim tab in level flight.  We are assuming 3 to 5 lbs. How can this be measured?

  

 Thanks in advance for your help.

  

 Paul Grimstad

 RV10  40450

 Portland, Or.

  

 [quote]   ---

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Fixitauto(at)aol.com
Guest

Posted: Wed May 14, 2008 3:56 pm Post subject: Rudder Trim Question

Hey Paul....It's Two foot punds right?   one on each  pedal?    

Rick Sked 

40185 

I think I now know where jAmEs McClow is hiding  out.



Wondering what's for Dinner Tonight? Get new twists on family favorites at AOL Food.

  [quote][b]

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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ricksked(at)embarqmail.co
Guest

Posted: Wed May 14, 2008 7:27 pm Post subject: Rudder Trim Question

Hey, if you know James, then you been hiding out awhile!!! Had Lasik on my eyes last week, see great, all but my monitor and those stinkin little letters   

Rick Sked 

40185 

do not archive

---

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