X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Sun, 18 Feb 2007 08:32:23 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d22.mx.aol.com ([205.188.144.208] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTP id 1845138 for lml@lancaironline.net; Sun, 18 Feb 2007 08:22:26 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.208; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d22.mx.aol.com (mail_out_v38_r7.6.) id q.bce.ec6beac (57317) for ; Sun, 18 Feb 2007 08:21:29 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sun, 18 Feb 2007 08:21:28 EST Subject: Re: [LML] Re: stainless covered teflon X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1171804888" X-Mailer: 9.0 Security Edition for Windows sub 5358 X-Spam-Flag: NO -------------------------------1171804888 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/18/2007 5:49:41 A.M. Central Standard Time, colyncase@earthlink.net writes: what's your reasoning on fuel and oil? Colyn, 1. Experience. Another airplane with aviation grade non-teflon lines that hardened and cracked with age. Especially a fuel line that sprung a leak on the ground with the cowl off. 2. Manufacturers usually recommend that old style aviation grade lines be replaced every 5 years. An onerous and expensive burden. 3. My SS braided teflon lines are over 10 years in use with no signs of deterioration. 4. Fuel/oil leaks can lead to fire. An undesirable consequence of lines that may leak. 5. Auto racing folk seem to like them and Earl's has a fine stock of lines and fittings. You might ask, "Surely there must be some drawbacks?" I would reply, "Yep." 1. Weight. These line tend to be heavier than the old fashioned ones. Also, every flex fluid line firewall forward is fire shielded. 2. Cost. The lines and fittings are more costly. At least hey were when I built my airplane. 3. The lines do not like to suffer a twist when installed and they can (will) take a set. 4. The SS braid should be treated as though you were installing a saw along its length. It is not likely to become abraded but, under vibration, it can chew its way thru almost anything if it is not supported properly. Fluid lines have certainly been interesting to me. If I were building my Lancair 320 today, I would probably install SS/teflon brake lines along with Grove wheels and brakes. I also used (and I am still using) the hydraulic flex lines supplied by Lancair in 1989 but I would consider others today. Finally, the Tygon lines originally supplied for fuel runs did not seem substantial enough for me so I replaced them, as I was building, with SS/teflon. Also, those old Tygon lines were not good for fuel as they hardened over time. Today, Tygon lines are available especially made for carrying fuel, but I still would use SS/teflon. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) A man has got to know his limitations. -------------------------------1171804888 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 2/18/2007 5:49:41 A.M. Central Standard Time,=20 colyncase@earthlink.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

what's your reasoning on fuel and oil?

Colyn,

1. Experience. Another airplane with aviation grade non-teflon li= nes=20 that hardened and cracked with age. Especially a fuel line that=20 sprung a leak on the ground with the cowl off.

2. Manufacturers usually recommend that old style aviation grade=20 lines be replaced every 5 years. An onerous and expensive burden.

3. My SS braided teflon lines are over 10 years in use with no signs of= =20 deterioration.

4. Fuel/oil leaks can lead to fire. An undesirable consequen= ce=20 of lines that may leak.

5. Auto racing folk seem to like them and Earl's has a fine stock of li= nes=20 and fittings.

You might ask, "Surely there must be some drawbacks?" I would rep= ly,=20 "Yep."

1. Weight. These line tend to be heavier than the old fashioned=20 ones. Also, every flex fluid line firewall forward is fire shielded.

2. Cost. The lines and fittings are more costly. At least h= ey=20 were when I built my airplane.

3. The lines do not like to suffer a twist when installed and they can=20 (will) take a set.

4. The SS braid should be treated as though you were installi= ng a=20 saw along its length. It is not likely to become abraded but, under=20 vibration, it can chew its way thru almost anything if it is not supported=20 properly.

Fluid lines have certainly been interesting to me. If I were buil= ding=20 my Lancair 320 today, I would probably install SS/teflon brake lines along w= ith=20 Grove wheels and brakes. I also used (and I am still using) the=20 hydraulic flex lines supplied by Lancair in 1989 but I would consider others= =20 today. Finally, the Tygon lines originally supplied for fuel runs did=20= not=20 seem substantial enough for me so I replaced them, as I was building, with=20 SS/teflon. Also, those old Tygon lines were not good for fuel as they=20 hardened over time. Today, Tygon lines are available especially=20 made for carrying fuel, but I still would use SS/teflon.=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

A m= an=20 has got to know his limitations.

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