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Bungee discussion

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DKrummel

Joined: 02 Nov 2008
Posts: 7
Location: Independence Airpark Oregon

Posted: Mon Jan 11, 2010 4:55 pm Post subject: Bungee discussion

Sam -  I am building an 801 and have questioned my EAA Tech Adviser on a different way to separate the elevator cables (and rudder cables) from rubbing together.  He pointed out how ultra-lights have been avoiding the rubbing of controls cables since their inception by threading the cables through a piece of high strength, high density plastic tubing.  A lot of ultra cables are complete encased in tubing - thus preventing any wear on the cable itself.  He recommend placing the tubing where the cables cross paths.  The tubing I.D. (inner dia.) should be slightly larger than the cable diameter.  

     There are three ways to anchor the tubing: 1) Where the tubing crosses and creates an "X" pattern, put two cable ties in the middle of the "X", one over the other in their own "X" pattern.  This locks the tubes from moving up and down the cable.  2) Build a support bracket at the "X" and attach the center of the "X" on the bracket.  And 3) (if your cables are not continuously in contact with each other)   Secure the tubing onto the cable to keep it from moving, but use a long enough piece of tubing that when the cables do touch, the tubing is at that location (+ or - a foot or so).  You will then get contact with the tubes - not the cables.

   This sounds like it should work pretty slick and I hope to use it for my 801 when I get to that stage in the building process.  My rudder cables will now have a more direct routing to the rudder horns without any slight "detours", as is their current path through the fuselage.  Hope you find this helps.

 

 Dennis Krummel  N801DK

 

 PS - I plan on using the hydraulic tubing.  It is very strong and has good resistance to wear.

 

   

 

  

   

 

   

 

  --

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_________________
Fly Friendly - Fly Safe
Zenith 801 / Lycoming IO360 / MT 3 Blade Prop

blackmore(at)platinum.ca
Guest

Posted: Mon Jan 11, 2010 6:00 pm Post subject: Bungee discussion

Try corelon ( spelling) truck air brake lines 

  

  [i]----

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agibeaut

Joined: 21 Mar 2007
Posts: 64

Posted: Mon Jan 11, 2010 7:27 pm Post subject: Bungee discussion

Sounds like a good plan, but do yourself a favor and do nothing until you rig the elevator cables, and then experience what happens as you move the stick left and right. You'll understand at that point. Cables rubbing is a secondary issue. The primary issue (as pointed out by some else prior) is the fact that the cables are not centered on the torque tube and will tighten and loosen as the stick is moved right and left. You need something to take up the slack (bungey) or you will be chasing this forever. I chased it for 3 nites before I finally listened to the guys on this list. You need a device to take up the slack, and rubbing cables will be eliminated when you do that. Just trying to help guys, and share the mistakes I've made so you don't have to make them. Good luck. 



--- On Mon, 1/11/10, dennkrumm(at)aol.com <dennkrumm(at)aol.com> wrote:



 	  Quote: 	
		   From: dennkrumm(at)aol.com <dennkrumm(at)aol.com>

 Subject: Bungee discussion

 To: zenith701801-list(at)matronics.com

 Date: Monday, January 11, 2010, 6:09 PM

 

  Sam -  I am building an 801 and have

 questioned my EAA Tech Adviser on a different way to

 separate the elevator cables (and rudder cables) from

 rubbing together.  He pointed out how ultra-lights have

 been avoiding the rubbing of controls cables since their

 inception by threading the cables through a piece of high

 strength, high density plastic tubing.  A lot of ultra

 cables are complete encased in tubing - thus preventing any

 wear on the cable itself.  He recommend placing the

 tubing where the cables cross paths.  The tubing I.D.

 (inner dia.) should be slightly larger than the cable

 diameter.  

 

     There are three ways to anchor the

 tubing: 1) Where the tubing crosses and creates an

 "X" pattern, put two cable ties in the middle of

 the "X", one over the other in their own

 "X" pattern.  This locks the tubes from

 moving up and down the cable.  2) Build a support

 bracket at the "X" and attach the center of the

 "X" on the bracket.  And 3) (if your cables

 are not continuously in contact with each other)  

 Secure the tubing onto the cable to keep it from moving, but

 use a long enough piece of tubing that when the cables do

 touch, the tubing is at that location (+ or - a foot or

 so).  You will then get contact with the tubes - not

 the cables.

 

   This sounds like it should work pretty slick and I

 hope to use it for my 801 when I get to that stage in the

 building process.  My rudder cables will now have a

 more direct routing to the rudder horns without any slight

 "detours", as is their current path through the

 fuselage.  Hope you find this helps.

 

 

 

 Dennis Krummel  N801DK

 

 

 

 PS - I plan on using the hydraulic tubing.  It is very

 strong and has good resistance to wear.

 

 

 

  

 

 

 

 

 

  

 

 

 

  

 

 

 

 -----Original

 Message-----

 

 From: sam hord <samhord2(at)gmail.com>

 

 To: zenith701801-list(at)matronics.com

 

 Sent: Sun, Jan 10, 2010 9:22 am

 

 Subject: Re: Zenith701801-List Digest: 1

 Msgs - 01/08/10

 

 

 

 

 

 

 

 

 

 

 

 How are you keeping the elevater cables separated so they

 do not rub and wear?

 

 Sam

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ggower_99(at)yahoo.com
Guest

Posted: Tue Jan 12, 2010 10:35 am Post subject: Bungee discussion

Nothig as simple and proven as the bungee cord...   

  

 Saludos

 Gary Gower.

 "Only add simplicity and lightness to an airplane"...



--- On Mon, 1/11/10, dennkrumm(at)aol.com <dennkrumm(at)aol.com> wrote:



 [quote]

From: dennkrumm(at)aol.com <dennkrumm(at)aol.com>

Subject: Bungee discussion

To: zenith701801-list(at)matronics.com

Date: Monday, January 11, 2010, 7:09 PM



  Sam -  I am building an 801 and have questioned my EAA Tech Adviser on a different way to separate the elevator cables (and rudder cables) from rubbing together.  He pointed out how ultra-lights have been avoiding the rubbing of controls cables since their inception by threading the cables through a piece of high strength, high density plastic tubing.  A lot of ultra cables are complete encased in tubing - thus preventing any wear on the cable itself.  He recommend placing the tubing where the cables cross paths.  The tubing I.D. (inner dia.) should be slightly larger than the cable diameter.  

    There are three ways to anchor the tubing: 1) Where the tubing crosses and creates an "X" pattern, put two cable ties in the middle of the "X", one over the other in their own "X" pattern.  This locks the tubes from moving up and down the  cable.  2) Build a support bracket at the "X" and attach the center of the "X" on the bracket.  And 3) (if your cables are not continuously in contact with each other)   Secure the tubing onto the cable to keep it from moving, but use a long enough piece of tubing that when the cables do touch, the tubing is at that location (+ or - a foot or so).  You will then get contact with the tubes - not the cables.

  This sounds like it should work pretty slick and I hope to use it for my 801 when I get to that stage in the building process.  My rudder cables will now have a more direct routing to the rudder horns without any slight "detours", as is their current path through the fuselage.  Hope you find this helps.



Dennis Krummel  N801DK



PS - I plan on using the hydraulic tubing.  It is very strong and has good resistance to wear.



 



 

 



 



 --

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cffd(at)pgrb.com
Guest

Posted: Sun Jan 17, 2010 9:06 am Post subject: Bungee discussion

I used a pulley on the cable and two springs (for  redundancy) to pull the down elevator cable to the right.  It is attached  to the bottom gusset on the mid fuselage "L" frame.

  

 Chuck D.

 N701TX 

   [quote][b]

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ch701builder(at)yahoo.com
Guest

Posted: Sun Jan 17, 2010 4:22 pm Post subject: Bungee discussion

Hey Chuck,

Could you take a quick picture of your setup for us.



Thanks,

Keith

N 38.9940

W 105.1305

Alt. 9,100'

Scratch - Working on cabin area

From: Chuck Deiterich <cffd(at)pgrb.com>

To: zenith701801-list(at)matronics.com

Sent: Sun, January 17, 2010 10:05:14 AM

Subject: Re: Bungee discussion  



          

 I used a pulley on the cable and two springs (for  redundancy) to pull the down elevator cable to the right.  It is attached  to the bottom gusset on the mid fuselage "L" frame.

  

 Chuck D.

 N701TX 

   [quote]

[b]

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