Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 828684 for flyrotary@lancaironline.net; Tue, 29 Mar 2005 11:59:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.72; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050329165816.KCYQ2032.imf24aec.mail.bellsouth.net@rd> for ; Tue, 29 Mar 2005 11:58:16 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: AN fittings.. Date: Tue, 29 Mar 2005 10:58:25 -0600 Message-ID: <025201c53480$85ce3870$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0253_01C5344E.3B33C870" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0253_01C5344E.3B33C870 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit OK... now.. what about for fittings/aluminum lines that appear NOT to be subjected to flex loads but still on the engine. For instance, running from a rigidly mounted PSRU to the engine block.. I have used aluminum lines for the oil drain, but it made me nervous. I've had a number of cracks on aluminum tubing at the brake calipers where there is some vibration. I currently have braided hose run from the drain fittings to the foot of the rotor housing. These are AN6, and I used aluminum fittings. I don't see this as being too much of a risk, but that doesn't make it right. The only certified point of reference for ridged hose on an engine that I know of is the governor line for a Lycoming. They use a ridged stainless tube for that. I've also seen braided hose used, but never aluminum. Primer lines tend to be copper, and they crack too. Basically, I wouldn't use aluminum tubing. Cheers, Rusty ------=_NextPart_000_0253_01C5344E.3B33C870 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

OK... now.. what about for fittings/aluminum lines = that appear=20 NOT to be
subjected to flex loads but still on the engine. For = instance,=20 running
from a rigidly mounted PSRU to the engine block..

 
I have = used aluminum=20 lines for the oil drain, but it made me nervous.  I've had a number = of=20 cracks on aluminum tubing at the brake calipers where there is some=20 vibration.  I currently have braided hose run from the drain = fittings to=20 the foot of the rotor housing.  These are AN6, and I used aluminum=20 fittings.  I don't see this as being too much of a risk, but that = doesn't=20 make it right.   
 
The only = certified point=20 of reference for ridged hose on an engine that I know of is the governor = line=20 for a Lycoming.  They use a ridged stainless tube for = that. =20  I've also seen braided hose used, but never aluminum.  Primer = lines=20 tend to be copper, and they crack too.  Basically, I wouldn't use = aluminum=20 tubing. 
 
Cheers,
Rusty
 



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