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Kevin,
Rigid tubes can be certainly be used, however, as I am certain you know,
you do need to ensure that they are approriately supported and braced.
Vibration has been know to fatique such lines if they are not of the proper
material, installed and supported appropriately. Copper lines for example
are notorious for becoming work hardened and brittle through vibration.
You clearly recognize the possibility of fatique by your use of the
stainless steel braided line between your firewall components and your
engine. I personally use only stainless steel braided lines for everything
as that essentially elminates the possiblity of failure due to vibration and
fatique. The down side is more weight and costs than the solid lines.
my $0.02 worth
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
----- Original Message -----
From: "kevin lane" <n3773@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, December 30, 2003 11:48 PM
Subject: [FlyRotary] Re: fuel rail plumbing (for RV-8)
with two rigidly mounted connections, the fuel rails and the regulator,
why
not use a rigid line which must be cheaper? on my Lycoming I have a
braided
lines between the firewall and the engine (fuel supply and oil
cooler-firewall mounted) and rigid lines everywhere else, fuel pump to
carb
too, simply because I didn't know to do it any differently. it has 1000+
hrs on it. (I'm not questioning your choice, just wanting to learn why)
Kevin Lane Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse w/ internet explorer)
----- Original Message -----
From: "Marvin Kaye" <marv@lancaironline.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, December 30, 2003 7:05 PM
Subject: [FlyRotary] Re: fuel rail plumbing (for RV-8)
> > > > I guess I'll have a braided line from the firewall to the
first
> rail,
> with the pump behind the firewall somewhere, and another braided line
for
> the return. somewhere I need to insert a fuel pressure regulator, since
I
> sawed off the one I had thinking it was something else (duh). will it
need
> to be in the engine compartment? < < <
>
>
>
> The fuel pressure regulator on the Eagle is located at the far end of
the
> rails. Fuel comes out of the firewall through a single -6 hose and tees
to
> the rails... at the other end of the rails there are another pair of -6
lines
> that hook up to each side of the regulator (photo attached). The -4
return
> line comes out of the bottom of the regulator and goes back to the
selected
> tank through the (fairly expensive) fuel selector valve.
>
> <Marv>
>
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