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No question you normally want to use fittings of matching metals. However, there has been some discussion about very small aluminum fittings (such as -3) not having much reserve strength (compared to larger aluminum fittings and of course steel fittings).
The Cleveland calipers I use come tapped for an (AN-4) - 1/8NPT fitting. I use this fitting to screw into the caliper. Then I use -4 Steel hose Fittings that mates with a -3 brake hose (strange I know, but they make them). Since the standard fittings for the Clevelands are the above mentioned AN -4 - 1/8 NPT fittings, I use the aluminum -4 fittings (NPT on one end) to screw into the aluminum calipers and screw the -4 steel hose fitting onto the AN portion of the caliper fitting. All the brake fittings on the RVs are -4(which I already had installed), so I stuck with that (except for the -3 hose). You can certainly use -4 lines, but I found them to feel a bit mushy for my taste and prefer the smaller -3 hose.
My 0.02 worth
Ed
----- Original Message ----- From: "al p wick" <alwick@juno.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, December 04, 2005 10:15 AM
Subject: [FlyRotary] Re: fuel/brake lines
You have aluminum lines, aluminum housing? Then I'd use aluminum
fittings.
-al wick
Artificial intelligence in cockpit, Cozy IV powered by stock Subaru 2.5
N9032U 200+ hours on engine/airframe from Portland, Oregon
Prop construct, Subaru install, Risk assessment, Glass panel design info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
On Fri, 02 Dec 2005 21:48:14 -0500 Ernest Christley
<echristley@nc.rr.com> writes:
The next question is "steel or aluminum brake/fuel fittings?". The
steel is obviously stronger, but wouldn't there be an increased risk
of
dissimilar metal corrosion?
-- This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
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-al wick
Artificial intelligence in cockpit, Cozy IV powered by stock Subaru 2.5
N9032U 200+ hours on engine/airframe from Portland, Oregon
Prop construct, Subaru install, Risk assessment, Glass panel design info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
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