The Murphy Builders Site

Hi

I have been trying to read between the lines on Wayne and Bob's comments
on wiring.

Has anyone seen any problems in the lower corner wrap where all those
holes go through? Do any cracks develop at the holes? I don't even
recall seeing any doublers around these holes.

Brake lines, amphib gear lines, and perhaps pitot lines, wing wiring etc
can make a lot of holes in a somewhat delicate area. With difficulty,
some of the lines could go through the sidewall behind the cage but that
seems to be an area to be cautious of as well.

What is the best way to locate the holes? I was thinking that one large
hole with a doubler might be better than the swiss cheese approach. I
have also considered exiting the brake and hydraulic lines through the
0.040 floor pan forward of the rudder pedals and then back through a
covered exterior channel.

Ken




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Ken, as an after thought to my "not a great place for extra holes on the
Fus-70's". I guess it's not really a big deal, as you are putting the hole
right in front of the slot that clears the wing strut attach fitting anyway.
Keep the holes minimum size and burr free.

Wayne

----- Original Message -----
From: <klehman@albedo.net>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, March 03, 2001 12:21 PM
Subject: wiring and plumbing


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Hi

I have been trying to read between the lines on Wayne and Bob's comments
on wiring.

Has anyone seen any problems in the lower corner wrap where all those
holes go through? Do any cracks develop at the holes? I don't even
recall seeing any doublers around these holes.

Brake lines, amphib gear lines, and perhaps pitot lines, wing wiring etc
can make a lot of holes in a somewhat delicate area. With difficulty,
some of the lines could go through the sidewall behind the cage but that
seems to be an area to be cautious of as well.

What is the best way to locate the holes? I was thinking that one large
hole with a doubler might be better than the swiss cheese approach. I
have also considered exiting the brake and hydraulic lines through the
0.040 floor pan forward of the rudder pedals and then back through a
covered exterior channel.

Ken

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Ken, I have been thinking the same thing. Unless
someone has better advice, my approach is:

Wing wires/pitot will go through one hole
(with .040 doubler) just forward of the strut
bracket.

My brakes will exit from under the floor area.

The main fuel line will go through a single hole
in the carry throughs. I have 2 full square
carry throughs on bungee gear.

If I can determine it is safe, I will drill two
more holes in the carry throughs about 3" away
from the center hole. This would allow my
battery cable and fuel return line to go back
through.

If not, I will exit these just forward of the
carry through and enter just aft with a cover of
some sort.

My tail wires (+ strobe, trim, etc) will go
through the existing holes in the lower plates on
the outer ends of the carry throughs

The antenna wires will go through the existing
holes in the upper plates on the outer ends of
the carry throughs.

It sure would be easier if I could have the
battery on the firewall.

Scott
hibbs@pacifier.com






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To: <murphy-rebel@dcsol.com>
From: Bob Patterson <apat@istar.ca>
Subject: Re: wiring and plumbing


Hi Ken !

I've never seen a problem with holes in this area, as long
as they were smoothly deburred, and had rubber grommets.

There <are> TWO things to consider in this area, though:

- Try to keep the pitot tubing & electrical wires fairly close
to the wing strut, as you want them to be hidden under the strut
fairing, (could be one larger hole, doubled) and ...

- Keep the brake lines close to the front of the gear leg,
and run them through the FLOOR just in front of the cage - this
makes it easy to run them down the front of the front gear tube,
UNDER the gear fairings. The closer they are to lining up with
the gear leg, the less flexing they'll suffer from gear movements,
too.


One of my biggest peeves with the latest Rebel is that
the original builder (not Wayne) ran the brake lines out of the
SIDE of the fuse, WELL forward of the gear tube. This is REALLY
presenting a challenge to get the hose into the fairing !! There
really isn't a tidy way !! :-( To compound the problem,
he used couplers to pass through the side, instead of just using
one length of the supplied plastic tubing - this leaves me with
larger diameter hoses, and fittings to deal with, too !!

.....bobp

-------------------------------------orig.------------------------------
At 09:21 AM 3/3/01 -0800, you wrote:

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Hi

I have been trying to read between the lines on Wayne and Bob's comments
on wiring.

Has anyone seen any problems in the lower corner wrap where all those
holes go through? Do any cracks develop at the holes? I don't even
recall seeing any doublers around these holes.

Brake lines, amphib gear lines, and perhaps pitot lines, wing wiring etc
can make a lot of holes in a somewhat delicate area. With difficulty,
some of the lines could go through the sidewall behind the cage but that
seems to be an area to be cautious of as well.

What is the best way to locate the holes? I was thinking that one large
hole with a doubler might be better than the swiss cheese approach. I
have also considered exiting the brake and hydraulic lines through the
0.040 floor pan forward of the rudder pedals and then back through a
covered exterior channel.

Ken

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