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closed loop rudder

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pitts_pilot(at)bellsouth.
Guest

Posted: Sun May 18, 2008 12:41 pm Post subject: closed loop rudder

Here's a pic of the bracket I cobbled up for the closed loop rudder cable.  The red string is where the 1/16" loop cable will go.  The reason for 1/16" cable is that I had the pulleys already.  It would be an easy mod to put larger pulleys and larger cable.

 

 You can see the mod I made to the rudder cable attachment ..... it's inside the tunnel.  I don't like sandy (in FL) shoes smacking the rudder cables so I moved them inside the tunnel.  It would be simpler to make brackets for the pulleys and put them on the outside of the tunnel, running the cable through the tunnel just under the heater valves.

 

 This is the first time I've tried sending a picture so we'll see what happens!!!

 Linn

 do not archive

 

 inserted picture:

 [img]cid:part1.05090501.04040509(at)bellsouth.net[/img]

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pitts_pilot(at)bellsouth.
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Posted: Sun May 18, 2008 1:55 pm Post subject: closed loop rudder

linn Walters wrote:

 	  Quote: 	
		   Here's a pic of the bracket I cobbled up for the closed loop rudder 

 cable. 

snip
	




Thought you should also know.

The reason for the cross arm holding the pulleys is that I was concerned 

with pulling the sides of the tunnel inwards if the pulleys were just 

mounted on brackets ...... (which would also be needed if the pulley 

brackets were on the outside).  The pivot on the right side allows me to 

adjust the tension by moving the left side. 



I could always preload the loop with an extension spring between the 

loop cable and one rudder pedal attach point.  That way I could bolt the 

left side down like the right side.  Work in progress.

Linn

do not archive

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daveleikam(at)wi.rr.com
Guest

Posted: Sun May 18, 2008 6:56 pm Post subject: closed loop rudder

Interesting design.  

  

 Have you considered the lever arm force on the tabs  holding the extensions to the rudder cables when the rudder hits the stops or  just the repeated forward and back pressures from the rudder in flight.   Could a small amount of continued flexing eventually break the tabs?  The  force on the tabs is now torque rather than tension.  Just my humble  observation.

  

 Dave Leikam

#40496  N89DA  (Reserved)

Muskego, WI



 [quote]   ---

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pitts_pilot(at)bellsouth.
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Posted: Mon May 19, 2008 5:20 am Post subject: closed loop rudder

Dave Leikam wrote:  	  Quote: 	
		              Interesting design.  

    

   Have you considered the lever arm force on the tabs holding the extensions to the rudder cables when the rudder hits the stops or just the repeated forward and back pressures from the rudder in flight.

 	
 Yes I did.  Don't have the figures handy ..... they're lost in my office clutter   .... but the tensile strength was way up there past what we can press on them.  The tube has the thickest wall I could find that didn't compromise the tab.

  	  Quote: 	
		       Could a small amount of continued flexing eventually break the tabs?

 	
 I don't think so ..... the original tab has an offset bend in it that doesn't straighten out ..... as best I can determine.

  	  Quote: 	
		       The force on the tabs is now torque rather than tension.  Just my humble observation.

 	
 Good point though!  Thanks for the note.

 Linn

 [quote]    

   Dave Leikam

 #40496  N89DA (Reserved)

 Muskego, WI

 [b]

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