Cliff
The blue corrugated tube used for home electrical wiring is lighter
than the thin PVC pipes. Most plumbing tubing are made to withstand
pressure, so they tend to be thick walled and heavier. The only
exception could be drain tubing. I will scout around Lowes to find a
suitable tubing. Thanks for the ideas.
--- Fred Fillinger <n3eu@comcast.net> wrote:
> <n3eu@comcast.net>
>
> <asarangan@yahoo.com>
> >
> > Thanks to many before me, I decided to install the blue corrugated
> > tubing as a raceway for the pitot/static tubes and wiring.
>
> Dou you mean corrugated around the circumference? One advantage of
> this conduit is easier for replacing/adding wires. I'd want
> something
> smooth, and ordinary polyethylene tubing is light, if maybe not the
> lightest available.
>
> If a builder wants to save all possible increments of weight, the
> Grumman AA-x series of aircraft use rubber grommets in the wing ribs,
> and the wings are glued together for very limited future access.
> They
> purposely do not neaten the bundle with ty-wraps, and flashlight
> inspection down the 15-foot length will suggest it was an awful way
> to
> do it. There's a ty-wrap at the grommet at either end for a little
> tension, so they don't flop too much., and there's a trick to add a
> wire -- take an existing wire to pull through two new ones, scrap the
> old one -- is why no internal ty-wraps.
>
> After 30+ yrs in the fleet, there's probably some grommets gettin'
> hard, and if one falls apart (the least accessible one!), wires will
> chafe on thin metal. No problem yet, maybe in another 15-20.... The
> difference in the XS wing is you won't be able to sight down the run
> with flashlight and tug on it to look for a problem at the grommets
> you can see. But there's no metal to short a wire either. Builder
> choice, IMO.
>
> Reg,
> Fred F.
>
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=====
Andrew Sarangan
http://www.geocities.com/asarangan
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