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03-03-2012, 06:20 PM
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Join Date: Nov 2010
Location: Lac du Flambeau, Wisconsin
Posts: 16
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Wing Conduit Question - Why Not?
First time poster...
I have opened the RV-9 main rib tooling holes closest to the spar to 5/8" according to the wing wiring .pdf. After the 5/8" OD bushings are installed, I think this should accommodate the wiring needs for a day VFR RV-9. The reason for using bushings instead of conduit is I just like the look of a neatly bundled wires...even though nobody will ever see them.
My question is about installing the 3/4" conduit that is also shown in the wing wiring .pdf. I really can't imagine having a need to run additional wires, but if one should ever come up, it seems like it would be a lot easier to add the conduit now instead of trying to drill additional holes in the wing ribs after the wings are closed. Are there any reasons not to install the conduit while the wings are being constructed besides a little more time and money?
I have searched the forums and a lot of you have installed the conduit. But I'm also sure a lot of you haven't.
Thanks,
__________________
Roger Grahl
Lac du Flambeau, WI
RV-9A Slider
Empennage - Completed
Wings - Completed
Fuselage - Completed
Finish Kit - Under Construction
VAF donation through October 2020
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03-03-2012, 07:11 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!!!!
Quote:
Originally Posted by SledDog
First time poster...
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Roger, Welcome to VAF---good to have you here.
Quote:
Originally Posted by rvmike
------ Enjoy your build. Did I just beat Mike S to this one?.
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Yep, sure did 
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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03-03-2012, 07:13 PM
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Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
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I did the bushings also. No conduit run for Aurora, as it is not part of the mission. It was a tough choice to build in lightness and not let project creep run rampant.
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Retired Dam guy. Life is good.
Brian, N155BKsold but bought back.
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03-03-2012, 07:19 PM
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Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 747
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conduit
I know I'm in the minority, but I didn't do conduit.
I can see the need for conduit if you are going to rivet on the wingtip. If the tip is removable it shouldn't be a big deal to run a fish down the grommets and pull a wire. A removable tip and a conduit seems like belt and suspenders to me.
Like all things, to each his own.
__________________
Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
O-360-A1A
1946 Cessna 120
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03-03-2012, 09:52 PM
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Join Date: Jun 2010
Location: Sioux Falls, SD
Posts: 209
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No conduit here. I plan on putting an expandable sleeve (chinese finger) over the wires and running thru the bushings. Plan on putting a dab of RTD on the sleeve at each bushing to keep it in place.
__________________
Joe
RV-9A N525XC
Superior IO-320
Dynon HDX
Flying as of 5-4-18
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03-03-2012, 10:37 PM
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Join Date: Mar 2005
Posts: 5,685
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I put in the conduit
It eliminates the need for bundle ties to keep the wires routed in a straight line, eliminated the need to deal with the string ties (or tie-wraps)for wire replacemenr if you need to change the wiring for any reason (original wire gauge too small), protect the wire bundle from the tools left inside when you closed up the wing. All that said I have yet to change a wire after 8 years of flying the airplane.
Bob Axsom
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03-03-2012, 11:27 PM
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Join Date: Feb 2006
Location: San Diego, CA, U.S.A.
Posts: 770
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Why not:
Do the following experiment:
Cut a short piece of that corrugated plastic conduit that Van's sells. Take it outside and set it down on a concrete surface well away from anything flammable. Use a match or a lighter to put a flame to the conduit material for one or two seconds until the conduit ignites. Take a few steps back so that you don't breath the smoke. Stand back and watch.
No conduit for me.
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03-03-2012, 11:55 PM
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Join Date: Mar 2005
Posts: 5,685
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I used standard plastic electrical conduit
Didn't use Van's.
Bob Axsom
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03-04-2012, 05:14 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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I ran conduit...and glad I did, sure makes it easy feeding those wires down. I too used electrical conduit from the aviation conduit isle at Lowes.
__________________
Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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03-04-2012, 06:44 AM
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Join Date: Jan 2011
Location: Adelaide South Australia, Australia
Posts: 193
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Try a different "condute"
[quote=roee;636026]Do the following experiment:
Cut a short piece of that corrugated plastic conduit that Van's sells. Take it outside and set it down on a concrete surface well away from anything flammable. Use a match or a lighter to put a flame to the conduit material for one or two seconds until the conduit ignites. Take a few steps back so that you don't breath the smoke. Stand back and watch.
What Roee said is true. However if you do the same to black irrigation pipe
(13mm Dripper line) It won't sustain a flame and goes out once you remove the heat source. It is also easier to get a wire down as it is smooth not corrugated.
Cheers
Jim
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