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wnorth(at)sdccd.edu
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 Posted: Thu Aug 30, 2007 7:51 am Post subject: conduit |
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To conduit or not to conduit, that is the question.
It is a waste of weight, but there are places where it is wise.
The bay spans in the -6 wing are not reachable by the design of arms which
remain attached to my body so there is conduit there, otherwise I avoid it.
Wrap probably doesn't reduce heat all that much over a loose thin conduit as
it really holds the wires tight together.
Rib stitching line or tie wraps with a little looseness between ties
probably do best for temperature.
I found these micro thin plastic sheathes that cover shower curtain rods at
Aero Depot for those few spans that nothing but a mini-monkey can get to.
They are split and can be reduced to fit right into a snap bushing very
easily.
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n616tb(at)btsapps.com
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| Posted: Thu Aug 30, 2007 8:03 am Post subject: conduit |
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I had a Cessna 170B that I added a heated pitot in place of the stock one.
I couldn't really get my arms in there either, but it was sure easy to add
all the wire I needed. There was no conduit, but there was existing wire.
I just used an existing wire to pull in a string, then added a new wire to
it and pulled it all back in with the string.
I personally did not put any conduit in my -6 as I see no reason for it.
However, if you are so inclined to do this, then there is absolutely nothing
wrong with it. Pick whatever you like and put it in. It is experimental
and we definitely get to choose what part of experimental we want to
exercise. This is especially true on something as non structural as a
conduit in the wing.
Tim
Do Not Archive
[quote] --
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Thu Aug 30, 2007 11:46 am Post subject: conduit |
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In a message dated 08/30/2007 10:54:21 AM Central Daylight Time, wnorth(at)sdccd.edu writes:
| Quote: | | It is a waste of weight |
>>>
This has been mentioned several times, so, feeling quite guilty, I went out to the shop and carefully measured off 12" of the 1/2 CPVC "counduit" I used in my plane, then weighed it on my wifes super-accurate electronic kitchen scale. Result: 1.25 oz. Ten feet per wing x2 added 1 lb, 9 oz to my plane. For kix&gigglz I grabbed 24 1/2" snap bushings and weighed. Result: .625 ounces.
I will be ripping the conduit out of my plane this weekend and installing the snap bushings...
Or not-
Mark do not archive
Get a sneak peek of the all-new AOL.com.
[quote][b]
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gcomfo(at)tc3net.com
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| Posted: Thu Aug 30, 2007 1:18 pm Post subject: conduit |
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[quote]
Subject: Re: conduit
In a message dated 08/30/2007 10:54:21 AM Central Daylight Time, wnorth(at)sdccd.edu writes:
| Quote: | | It is a waste of weight |
>>>
This has been mentioned several times, so, feeling quite guilty, I went out to the shop and carefully measured off 12" of the 1/2 CPVC "counduit" I used in my plane, then weighed it on my wifes super-accurate electronic kitchen scale. Result: 1.25 oz. Ten feet per wing x2 added 1 lb, 9 oz to my plane. For kix&gigglz I grabbed 24 1/2" snap bushings and weighed. Result: .625 ounces.
I will be ripping the conduit out of my plane this weekend and installing the snap bushings...
Or not-
Mark do not archive
A conduit in not necessary. I prefer, and have used, neoprene grommets which I like better than snap bushings because of the edge on the id. of the snap bushings. If you fear the need for future wires, a monofilament line installed initially will aid in pulling the wire. The grommet method was used by Meyers Aircraft 50 or so years ago.
Gordon Comfort
N363GC
[b]
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Thu Aug 30, 2007 1:59 pm Post subject: conduit |
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Thanks Gordon –
Dan Checkoway has given a great posting on his website of the advantage and the clear wear characteristics associated with wire runs. I regularly ask builders during EAA Tech visits what is called out for the maximum run distance between support points of cable runs. We often talk about means to correctly support such runs over distances and in proximity to moving parts, sharp edges and near hydro-carbon fluid lines.
I forwarded to Tim and his RV University, a color PowerPoint presentation on wiring aircraft and pictures of what you might find a few years down the road with our RV-10s. At the airline, we are now immersed (Literally) in re-entering fuel tanks to bring them compliant with the new FAA –SFAR 88 requirements. To say the least, compliance is a pain in the butt. The MOD is jokingly written poorly and we respond with the quip that at least it will prevent another US Navy missile from bringing down another airliner and wasting millions by the FAA to explain it away.
There are very few locales where an enclosed conduit are justified. There are many compelling reasons why exposed cable bundles are well merited. Retrofit is a novel concept during construction and Tim presented an offer to buy wire spoons from Stein. As builders the choice is yours.
Several builders know that I stress the phrase “Serviceability” during my visit, which often is ignored during construction as the “Initial Manufacturer” and begins in earnest immediately upon attainment of your coveted DAR authorization for Phase I Fly-off. “Why didn’t I think of that back then?”
One of the few places where it is merited is in areas of crushability to the bundle from physical entry or near components where shedding heat or protection from other environmental factors is important. The ability to view heat build-up, chafe damage, trouble shoot wire run issues and save weight are all important. Remember that everything adds weight. Weight increase, brings down VANS beloved horsepower to weight ratio = Performance. And by now we know he hates builders who increase horsepower (Hot Rodder) while throwing additional weight on the equation.
Chose wisely.
John Cox – EAA Tech Advisor #5242
Do not Archive but do consider researching the archives on this well posted issue within the RV 10 University database
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Gordon or Marge
Sent: Thursday, August 30, 2007 2:16 PM
To: rv-list(at)matronics.com
Subject: RE: conduit
[quote]
Subject: Re: conduit
In a message dated 08/30/2007 10:54:21 AM Central Daylight Time, wnorth(at)sdccd.edu writes:
| Quote: |
It is a waste of weight |
This has been mentioned several times, so, feeling quite guilty, I went out to the shop and carefully measured off 12" of the 1/2 CPVC "counduit" I used in my plane, then weighed it on my wifes super-accurate electronic kitchen scale. Result: 1.25 oz. Ten feet per wing x2 added 1 lb, 9 oz to my plane. For kix&gigglz I grabbed 24 1/2" snap bushings and weighed. Result: .625 ounces.
I will be ripping the conduit out of my plane this weekend and installing the snap bushings...
Or not-
Mark do not archive
A conduit in not necessary. I prefer, and have used, neoprene grommets which I like better than snap bushings because of the edge on the id. of the snap bushings. If you fear the need for future wires, a monofilament line installed initially will aid in pulling the wire. The grommet method was used by Meyers Aircraft 50 or so years ago.
Gordon Comfort
N363GC
[b]
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ceengland(at)bellsouth.ne
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| Posted: Tue Sep 04, 2007 11:05 am Post subject: conduit |
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Wheeler North wrote:
| Quote: |
To conduit or not to conduit, that is the question.
It is a waste of weight, but there are places where it is wise.
snipped
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| Quote: |
I found these micro thin plastic sheathes that cover shower curtain rods at
Aero Depot for those few spans that nothing but a mini-monkey can get to.
They are split and can be reduced to fit right into a snap bushing very
easily.
Shower rod covers are far and away the lightest 'conduit' I was able to
|
find, & have the advantage of fitting whatever size hole we are likely
to drill in the ribs. But they are still a lot heavier (many ounces vs.
a few grams) than the snap bushings.
Charlie
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jpl(at)showpage.org
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| Posted: Tue Sep 04, 2007 11:34 am Post subject: conduit |
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Going on the advice of my tech counselor, I have purchased the very
very lightweight flexible conduit that Van's sells. But I'm now
wondering what paths I need for all the wires.
-Position lights in wingtips
-Strobe lights in wingtips
-Landing lights near wingtips
-Autopilot servo line at the halfway mark
-And I don't know if I should expect to put any antennas in wingtips
I presume I shouldn't run all of these together. So if not, I don't
know how many holes I should be drilling in my ribs for all the above.
-Joe
On Sep 4, 2007, at 2:04 PM, Charlie England wrote:
| Quote: |
<ceengland(at)bellsouth.net>
Wheeler North wrote:
>
> To conduit or not to conduit, that is the question.
> It is a waste of weight, but there are places where it is wise.
snipped
> I found these micro thin plastic sheathes that cover shower
> curtain rods at
> Aero Depot for those few spans that nothing but a mini-monkey can
> get to.
> They are split and can be reduced to fit right into a snap bushing
> very
> easily.
>
Shower rod covers are far and away the lightest 'conduit' I was
able to find, & have the advantage of fitting whatever size hole we
are likely to drill in the ribs. But they are still a lot heavier
(many ounces vs. a few grams) than the snap bushings.
Charlie
|
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