X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Mon, 19 Feb 2007 02:29:02 -0500 Message-ID: X-Original-Return-Path: Received: from mx2.pshift.com ([216.57.116.7] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTP id 1846262 for lml@lancaironline.net; Mon, 19 Feb 2007 00:16:10 -0500 Received-SPF: none receiver=logan.com; client-ip=216.57.116.7; envelope-from=colyncase@earthlink.net Received: from ccaselt (unverified [216.57.118.215]) by mx2.pshift.com (Vircom SMTPRS 4.4.568.0) with SMTP id for ; Mon, 19 Feb 2007 00:15:25 -0500 Received-SPF: none (mx2.pshift.com: domain of colyncase@earthlink.net does not designate any permitted senders) X-Modus-BlackList: 216.57.118.215=OK;colyncase@earthlink.net=OK X-Modus-RBL: 216.57.118.215=Excluded X-Modus-Trusted: 216.57.118.215=NO X-Modus-Audit: FALSE;0;0;0 X-Original-Message-ID: <02f801c753e4$f7c68560$0302a8c0@nvidia.com> From: "colyncase on earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: stainless covered teflon X-Original-Date: Sun, 18 Feb 2007 21:15:24 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02F5_01C753A1.E7832480" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_02F5_01C753A1.E7832480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable makes sense. I didn't comprehend: Also, every flex fluid line firewall forward is fire shielded. Are you saying stainless lines are not fire shielded or just that fire = shielding is additional weight beyond the stainless? or that stainless = is a form of fire shielding? ----- Original Message -----=20 From: Sky2high@aol.com=20 To: lml=20 Sent: Sunday, February 18, 2007 5:32 AM Subject: [LML] Re: stainless covered teflon 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.=20 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.=20 Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) A man has got to know his limitations. ------=_NextPart_000_02F5_01C753A1.E7832480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
makes sense.
I didn't comprehend:
 
Also, every flex fluid line firewall forward is fire = shielded.
 
Are you saying stainless lines are not fire shielded or just that = fire=20 shielding is additional weight beyond the stainless?   or that = stainless is a form of fire shielding?
----- Original Message -----
From:=20 Sky2high@aol.com=20
To: lml
Sent: Sunday, February 18, 2007 = 5:32=20 AM
Subject: [LML] Re: stainless = covered=20 teflon

In a message dated 2/18/2007 5:49:41 A.M. Central Standard Time, = colyncase@earthlink.net=20 writes:
what's your reasoning on fuel and = oil?
Colyn,
 
1. Experience.  Another airplane with aviation grade = non-teflon=20 lines that hardened and cracked with age.  Especially a fuel = line=20 that 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 = consequence=20 of lines that may leak.
5. Auto racing folk seem to like them and Earl's has a fine stock = of=20 lines and fittings. 
 
You might ask, "Surely there must be some drawbacks?"  I = would=20 reply, "Yep."
 
1. Weight.  These line tend to be heavier than the old = fashioned=20 ones.  Also, every flex fluid line firewall forward is fire=20 shielded.
2. Cost.  The lines and fittings are more costly.  At = least hey=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 = installing=20 a 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=20 building my Lancair 320 today, I would probably install SS/teflon = brake lines=20 along with Grove wheels and brakes.  I also used (and I am still=20 using) the hydraulic flex lines supplied by Lancair in 1989 but I = would=20 consider others today.  Finally, the Tygon lines originally = supplied for=20 fuel runs did not seem substantial enough for me so I replaced them, = as I was=20 building, with SS/teflon.  Also, those old Tygon lines were not = good for=20 fuel as they hardened over time.  Today, Tygon lines are = available=20 especially made for carrying fuel, but I still would use = SS/teflon.=20
 
Scott=20 Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

A man has got to know his=20 limitations.
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