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Wires out in the wingtips

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pcowper(at)webtv.net (Pet
Guest

Posted: Sat Apr 01, 2006 10:28 am Post subject: Wires out in the wingtips

I ran some white frosted tubing from Orchard Supply Hardware Store that

is intended for refrigerator water supply or some such.  It is 5/8"

diameter and fairly rigid but can be easily bent.  I used snap grommets,

but had to ream them out to make the hose slip through easily.  I think

the snap grommets are 3/4 with an "alleged" 5/8 inner diameter.



I followed someone's post that it is better to run the wiring conduit

closer to the upper skin to make riveting on the lower skin later on

easier.  After the upper skin is riveted, the hose can be threaded

through the wing ribs. It will be out of the way of the later more

limited access lower skin riveting.  The plastic/vinyl or poly-whatever

substance tubing is sturdy enough that it will not sag down in hot

weather and interfere with the aileron controls.



I like the semi-flexible tubing better than the rigid pvc sprinkler pipe

some have used.  A string with a rag tied to it will shoot right through

the tubing with a vacuum cleaner held to the other end for fishing wires

later on.  I left a string in each conduit tube with a metal washer tied

to each end when I stored my wings away.



Pete Cowper

RV8 #81139

Visalia, CA

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ceengland(at)bellsouth.ne
Guest

Posted: Sat Apr 01, 2006 4:51 pm Post subject: Wires out in the wingtips

Pete Cowper wrote:



 	  Quote: 	
		  



I ran some white frosted tubing from Orchard Supply Hardware Store that

is intended for refrigerator water supply or some such.  It is 5/8"

diameter and fairly rigid but can be easily bent.  I used snap grommets,

but had to ream them out to make the hose slip through easily.  I think

the snap grommets are 3/4 with an "alleged" 5/8 inner diameter.



I followed someone's post that it is better to run the wiring conduit

closer to the upper skin to make riveting on the lower skin later on

easier.  After the upper skin is riveted, the hose can be threaded

through the wing ribs. It will be out of the way of the later more

limited access lower skin riveting.  The plastic/vinyl or poly-whatever

substance tubing is sturdy enough that it will not sag down in hot

weather and interfere with the aileron controls.



I like the semi-flexible tubing better than the rigid pvc sprinkler pipe

some have used.  A string with a rag tied to it will shoot right through

the tubing with a vacuum cleaner held to the other end for fishing wires

later on.  I left a string in each conduit tube with a metal washer tied

to each end when I stored my wings away.



Pete Cowper

RV8 #81139

Visalia, CA




	


The best (meaning lightest) & cheapest (~$1 each) idea I've seen was 

posted by someone else recently. Use the plastic snap-on covers for 

shower curtain rods. Wally World or other 3rd world aviation supply 

outlet. They are a little over an inch in dia with a slit down the 

entire length. With a 3/4" hole, you just squeeze 'em down slightly & 

slide 'em in. Barely measurable loss in dia, also.



I ended up just using 3/4" snap bushings. I wanted a spare path for 

future expansion. I weighed the bushings vs. the tubes & it was 

something like 2 grams vs. 6 grams & I didn't want the extra weight. 



Another idea someone mentioned was the clear tubes used as safety covers 

for fluorescent lights. Also good, but heavier (still much lighter than 

any kind of regular tubing intended to carry liquids or pressure). 

Again, very thin wall so not much loss of wire capacity.



Whatever you use, don't forget the string (twice as long as the wing).



Charlie

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