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Wires out in the wingtips

 
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pcowper(at)webtv.net (Pet
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PostPosted: Sat Apr 01, 2006 10:28 am    Post subject: Wires out in the wingtips Reply with 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


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ceengland(at)bellsouth.ne
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PostPosted: Sat Apr 01, 2006 4:51 pm    Post subject: Wires out in the wingtips Reply with quote

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. Smile

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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