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Hi, David....this subject came up recently on the Canard Aviator's site. A few builders stated that they received their Lycoming engines with aluminum fittings on them. The general consensus was that larger fittings were fine in aluminum, but most people felt that for the smaller fittings, aroung one quarter inch, they would feel better with steel. Hope this helps. Paul Conner
----- Original Message ----- From: "David Staten" <Dastaten@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 29, 2005 10:12 AM
Subject: [FlyRotary] AN fittings..
I was perusing the Velocity manual online (sorry, not a public site) and came across a statement with regards to AN fittings needing to be steel if they are situated ON the engine. This was in the context of the lycoming installation instructions, and plumbing the "per plans" oil cooler in the nose to the engine in the back.
The direct quote is "all fittings that are attached to an engine need to be steel fittings. Aluminum fittings are not acceptable." Its in bold.
Considering I am going to be sending the oil into a fitting that is connected to an aluminum bypass block on the pedestal, in OUR (rotary) situations is this a critical issue? And what is/was the rationale for not using AL fittings on the Lyc's? Dissimilar metals? Heat expansion stresses? Fatigue?
Dave
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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