Message-ID: <02e701c4020d$d433a000$6401a8c0@Davidscmptr>
Reply-To: "David Carter" <dcarter@datarecall.net>
From: "David Carter" <dcarter@datarecall.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3062653@logan.com>
Subject: Aluminum AN fittings - Safety (was Re: [FlyRotary] Re: ready to start?
Date: Thu, 4 Mar 2004 11:26:28 -0600
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Paul,

You mentioned "aluminum 1/4 NPT to -6AN adapter".  It is my understanding
that there is a real risk in using aluminum fittings on engines due to lack
of "fatigue life" robustness of aluminum, compared to steel AN fittings.
There have been cases of these aluminum fittings eventually breaking off
where they are threaded into the engine block.

It is my understanding, from reading the "lists" and articles in Kitplanes &
Sport Aviation, that steel fittings are preferred over aluminum - that
aluminum can actually be considered a safety hazard.

David

----- Original Message ----- 
From: "sqpilot@earthlink" <sqpilot@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, March 04, 2004 7:02 AM
Subject: [FlyRotary] Re: ready to start?


> Yes, Jim....I have an .040 restrictor in the fitting at the beginning of
the
> line. I simply took the aluminum 1/4 NPT to -6AN adapter, and had it
welded
> closed. I then drilled the .040 hole through the adapter. I felt it would
be
> better to put the adapter just before the hose rather than after it, so
that
> if the hose should develop a leak, it will be after the restrictor.
Thanks
> for helping me find any possible problems.  Paul Conner
>
>