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Cable ties (Use PVC instead)

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nfivesl(at)yahoo.com
Guest

Posted: Fri Mar 17, 2006 7:05 pm Post subject: Cable ties (Use PVC instead)

Hi Don:



Scott Laughlin here.  It was nice meeting you last

week at the EAA meeting.  I chose to install thin-wall

pvc pipe in my wings and I'm really glad I did.  Since

you haven't closed up the wing, this would be your

last chance to do this.  I found that it was nice to

be able to close up the wing, then worry about wires

later.  I ended up adding a few more wires after the

fact and it was nice to have the pipe in there. Here's

a photo or two:



http://www.cooknwithgas.com/5_20_04_WingInside.JPG



Here you can see the .025 brackets I riveted to the

ribs. Use a hole saw that is just smaller than the

pipe and file the holes larger with a round file for a

tight fit.  Use JB weld to permanently affix the pipe

at the bracket holes.



http://www.cooknwithgas.com/5_20_04_Leftwing.JPG



Take care,



Scott Laughlin

EAA Chapter 80

www.cooknwithgas.com

--- Don Mountain <mountain4don(at)yahoo.com> wrote:



 	  Quote: 	
		   

 <mountain4don(at)yahoo.com>

 

 The local EAA tech counselor did an inspection on

 the left wing I am getting ready to close up, and

 had me tie the wires down better.

marinegunner(at)gmail.com
Guest

Posted: Fri Mar 17, 2006 8:17 pm Post subject: Cable ties (Use PVC instead)

Scott,

Grand idea - those pvc pipes. I am reopening my 701 wings and will install

the pipes while inside.

--

Semper Fi,

Steven R. Hulland

CH 701, Amado, AZ



This and all other incoming/outgoing email, attachments and replies scanned

prior to opening/sending and uses an external firewall to help insure virus

mountain4don

Joined: 18 Jan 2006
Posts: 29

Posted: Sat Mar 18, 2006 6:15 am Post subject: Cable ties (Use PVC instead)

Hello Scott:



I already have all of my wiring running through the ribs in rubber grommets in the conventional manner.  But you will have the same problem that I am while running your wingtip light wires from the ends of your PVC pipe out through the lightening hole in the end of the main rib.  How do I tie the bundle of wires in the middle of that hole as suggested by the inspector with cable ties?  And how are you going to get the aileron trim wire fished into the side of that PVC pipe?



Also, I noticed in your photos that you appear to have two stiffener angles on every rib down your wing?  What are these for?  Or did you change the design and use a lighter metal sheet  to fabricate your main wing ribs?  I wonder how much your plane is going to weigh when you get it finished with all of this extra stuff?



Don



 I chose to install thin-wall

pvc pipe in my wings and I'm really glad I did.  Since

you haven't closed up the wing, this would be your

last chance to do this.  I found that it was nice to

be able to close up the wing, then worry about wires

later.  I ended up adding a few more wires after the

fact and it was nice to have the pipe in there.

		

---------------------------------

Bring photos to life! New PhotoMail  makes sharing a breeze.

_________________
Zenith 601XL, tail done, working on wings

dredmoody(at)cox.net
Guest

Posted: Sat Mar 18, 2006 6:42 am Post subject: Cable ties (Use PVC instead)

PVC might be cheaper and more readily available but what about soft aluminum 

tubing from A.S? It is probably lighter and will form to any reasonably 

gentle bend that is needed.



Ed Moody II

Rayne LA

601XL working on tail



 	  Quote: 	
		   Scott,

 Grand idea - those pvc pipes. I am reopening my 701 wings and will install

 the pipes while inside.

 --

 Semper Fi,

 Steven R. Hulland

 CH 701, Amado, AZ

dredmoody(at)cox.net
Guest

Posted: Sat Mar 18, 2006 7:03 am Post subject: Cable ties (Use PVC instead)

" How do I tie the bundle of wires in the middle of that hole as suggested 

by the inspector with cable ties?  And how are you going to get the aileron 

trim wire fished into the side of that PVC pipe? "

I suggest using soft aluminum tubing for conduit. You can choose from 

several sizes to use the smallest (lightest) one that will do. Scott's 

brackets look like a good way to avoid drilling extra holes through the ribs 

(except for a couple of rivet holes for the bracket of course). I also 

suggest snap bushings in the bracket to reduce wear on the tubing from 

vibration (lighter and easier to slide the tubing through).



As for the second wire from the aileron trim, run a second small daimeter 

tube using a second hole in those same brackets. One of the reasons I like 

the aluminum tubing is that it can be formed to any reasonably gentle curve 

you desire. That allows you to bring the end of the tube at the wingtip, for 

instance, right to the underside of the postion light/ strobe fixture incase 

you ever need to access the end of the tube again through the fixture hole. 

Also, the wire is supported all the way along its run. Pull the wire through 

before forming to help minimize kinking. The stuff is available from 

Aircraft Spruce.



Ed Moody II

Rayne LA

601XL working on tail

nfivesl(at)yahoo.com
Guest

Posted: Sat Mar 18, 2006 8:27 am Post subject: Cable ties (Use PVC instead)

Hi Don:



Not sure what you mean by a main rib.  My XL wings go

all the way to the fuselage and the PVC passes through

all of the ribs.  This photo may show it better:



http://www.cooknwithgas.com/3_1_04_SomePlumbing.JPG



You can also see from this picture that I have

grommets installed for the trim wire.  I haven't

installed the trim wire yet so I'm not dead set on

this yet.  



For the passage through the center spar under the

yoke, I use split loom and use a cable clamps to hold

it in place. 



The stiffners on the ribs are just for extra support

because it was easy to do.  The weight is

insignificant.  We will know soon enough how much my

airplane weighs since I'll be weighing it soon. Today

I plan to weigh the engine and I'll report on that.  



SL



Do Not Archive

--- Don Mountain <mountain4don(at)yahoo.com> wrote:



 	  Quote: 	
		   

 <mountain4don(at)yahoo.com>

 

 Hello Scott:

 

 

 Also, I noticed in your photos that you appear to

 have two stiffener angles on every rib down your

 wing?  What are these for?  Or did you change the

 design and use a lighter metal sheet  to fabricate

 your main wing ribs?  I wonder how much your plane

 is going to weigh when you get it finished with all

 of this extra stuff?

pmaxpmax(at)hotmail.com
Guest

Posted: Sat Mar 18, 2006 9:07 am Post subject: Cable ties (Use PVC instead)

No offense intended, but I think the "conduit" idea is overkill.  Why not 

just use simple grommets from the hardware store penetrating the wing rib.  

If you are worried about the wire moving back and forth through the grommet, 

just put a wire tie on either side of the grommet.  This is common practice 

in penetrations through sheet metal.  There should only be a couple of wires 

going throug each grommet anyway.



Phil Maxson

N601MX

XL/Corvair

3 hours on the Hobbs.



 	  Quote: 	
		  From: "Edward Moody II" <dredmoody(at)cox.net>

Subject: Re: Cable ties (Use PVC instead)






" How do I tie the bundle of wires in the middle of that hole as suggested

by the inspector with cable ties?  And how are you going to get the aileron

trim wire fished into the side of that PVC pipe? "

I suggest using soft aluminum tubing for conduit.  <<SNIP>>

gboothe(at)calply.com
Guest

Posted: Sat Mar 18, 2006 9:15 am Post subject: Cable ties (Use PVC instead)

I think his idea was routing and/or re-routing of wires in the future. Not a 

bad idea for those of us who want to build a more simple aircraft with the 

option of updating later.



Gary Boothe, Cool, CA

<gboothe(at)calply.com>

601HDSTD, WW Corvair Conv. - complete

Tail Group - complete. Working on wings...



Do not archive



---

dredmoody(at)cox.net
Guest

Posted: Sat Mar 18, 2006 9:19 am Post subject: Cable ties (Use PVC instead)

" No offense intended, but I think the "conduit" idea is overkill."



No offense taken Phil. I think a Corvair engine conversion is overkill in 

pusuit of economy. That's why they're called experimental aircraft.



Ed



Do Not Archive

mountain4don

Joined: 18 Jan 2006
Posts: 29

Posted: Mon Mar 20, 2006 6:43 am Post subject: Cable ties (Use PVC instead)

Hello Scott,



The PVC makes your wing look very clean inside.  Not much extra stuff like I seem to have.  Where I am having trouble tying the wires down is after they pass up the wing through the main ribs in grommets, they make a turn and go through a lightening hole in the main spar extention, just like you will have to do after they come out of the end of your PVC.  I have the flasher unit mounted on the back side of the main spar like the instructions from ZAC have it.  And if I ever had to remove the wingtip marker lights, I can take out the headlight, reach in through the headlight hole and unplug the wires from the flasher light and running light, and remove the socket from the end of the wing.  So I was looking for a removal method of strapping down the wires through the lightening hole.



Any chance of coming over sometime and looking at your plane.  You are much farther along than I am.  And I need all the help I can get on the stuff not included in ZAC's instructions.



Don



N5SL <nfivesl(at)yahoo.com> wrote: 

Not sure what you mean by a main rib.  My XL wings go

all the way to the fuselage and the PVC passes through

all of the ribs.  This photo may show it better:



http://www.cooknwithgas.com/3_1_04_SomePlumbing.JPG



You can also see from this picture that I have

grommets installed for the trim wire.  I haven't

installed the trim wire yet so I'm not dead set on

this yet.  



For the passage through the center spar under the

yoke, I use split loom and use a cable clamps to hold

it in place. 

		

---------------------------------

Brings words and photos together (easily) with

_________________
Zenith 601XL, tail done, working on wings

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