Return-Path: Received: from [65.54.169.64] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3064068 for flyrotary@lancaironline.net; Thu, 04 Mar 2004 22:05:04 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 4 Mar 2004 19:05:03 -0800 Received: from 199.183.194.245 by bay3-dav34.bay3.hotmail.com with DAV; Fri, 05 Mar 2004 03:05:03 +0000 X-Originating-IP: [199.183.194.245] X-Originating-Email: [kerrjb@msn.com] X-Sender: kerrjb@msn.com From: "WALTER KERR" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Aluminum AN fittings - Safety (was Re: [FlyRotary] Re: ready to start? Date: Thu, 4 Mar 2004 22:06:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C40234.EA842420" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 8.5 X-MimeOLE: Produced By MSN MimeOLE V8.50.0017.1202 Seal-Send-Time: Thu, 4 Mar 2004 22:06:16 -0500 Message-ID: X-OriginalArrivalTime: 05 Mar 2004 03:05:03.0877 (UTC) FILETIME=[A7CF2B50:01C4025E] This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C40234.EA842420 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ed, Van used to recommend only steel AN fittings on the lycomings until it = was pointed out that the brand new engines were shipped from the factory = with some flight critical aluminum at which time Van backed away from = his recommendation.=20 Did the DIE variable length fly yet? Bernie ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Thursday, March 04, 2004 4:00 PM Subject: [FlyRotary] Re: Aluminum AN fittings - Safety (was Re: = [FlyRotary] Re: ready to start? ----- Original Message -----=20 From: "David Carter" To: "Rotary motors in aircraft" Sent: Thursday, March 04, 2004 12:26 PM Subject: [FlyRotary] Aluminum AN fittings - Safety (was Re: = [FlyRotary] Re: ready to start? > 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 I suspect that in case of an engine with lots of vibration such as an Lycoming that steel AN fittings are a prudent option. Most folks I = know flying rotaries use Aluminum fittings and as yet, I have not hear of = one failing. But then that might be because only Tracy has any = considerable number of hours yet. In some cases - like fittings to radiators - = there is little choice but to use aluminum fittings. Something to keep our = ears open to anyone who has had bad experience with aluminum fittings. Needless = to say any fitting whether steel or aluminum should have minimum stress = from hose/tubing attached to the fitting. Ed Anderson >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_001A_01C40234.EA842420 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Ed,

Van used to recommend only steel AN fittings on the lycomings until = it was=20 pointed out that the brand new engines were shipped from the factory = with some=20 flight critical aluminum at which time Van backed away from his = recommendation.=20

Did the DIE variable length fly yet?

Bernie

----- Original Message -----

From: Ed Anderson

To: Rotary motors in = aircraft

Sent: Thursday, March 04, 2004 = 4:00=20 PM

Subject: [FlyRotary] Re: = Aluminum AN=20 fittings - Safety (was Re: [FlyRotary] Re: ready to start?

----- Original Message -----
From: "David = Carter"=20 <dcarter@datarecall.net>
= To:=20 "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent:=20 Thursday, March 04, 2004 12:26 PM
Subject: [FlyRotary] Aluminum AN = fittings=20 - Safety (was Re: [FlyRotary] Re:
ready to start?

>=20 Paul,
>
> You mentioned "aluminum 1/4 NPT to -6AN = adapter". =20 It is my understanding
> that there is a real risk in using = aluminum=20 fittings on engines due to
lack
> of "fatigue life" = robustness of=20 aluminum, compared to steel AN fittings.
> There have been cases = of=20 these aluminum fittings eventually breaking off
> where they are = threaded into the engine block.
>
> It is my = understanding, from=20 reading the "lists" and articles in Kitplanes
&
> Sport = Aviation,=20 that steel fittings are preferred over aluminum - that
> = aluminum can=20 actually be considered a safety hazard.
>
> David

I = suspect=20 that in case of an engine with lots of vibration such as = an
Lycoming that=20 steel AN fittings are a prudent option. Most folks I = know
flying=20 rotaries use Aluminum fittings and as yet, I have not hear of=20 one
failing. But then that might be because only Tracy has = any=20 considerable
number of hours yet. In some cases - like fittings to=20 radiators - there is
little choice but to use aluminum=20 fittings. Something to keep our ears open
to anyone who has = had bad=20 experience with aluminum fittings. Needless to
say any = fitting=20 whether steel or aluminum should have minimum stress = from
hose/tubing=20 attached to the fitting.

Ed = Anderson

>> =20 Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive: http://lancai= ronline.net/lists/flyrotary/List.html

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