X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao101.cox.net ([68.230.241.45] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2374667 for flyrotary@lancaironline.net; Mon, 08 Oct 2007 01:25:18 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao101.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071008052439.XHGP23153.fed1rmmtao101.cox.net@fed1rmimpo01.cox.net> for ; Mon, 8 Oct 2007 01:24:39 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo01.cox.net with bizsmtp id xhQd1X0064AaN600000000; Mon, 08 Oct 2007 01:24:38 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Hose clamp myth busters Date: Sun, 7 Oct 2007 22:25:37 -0800 Message-ID: <000001c80974$0abacdd0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C80930.FC978DD0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C80930.FC978DD0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Maybe this is one of those things that isn't terribly obvious, but - having used a variety of screw type clamps - I'm wondering why plain old spring clamps aren't suitable for this application. I can't ever remember having one fail in service. (photos below) Dale R. I think they are fine for small diameter hoses for little and/or low pressure. I doubt they get the clamping force needed for coolant system pressures; so on a plane I wouldn't trust them for even small hoses. The spring wire version concentrates the force on such a small area more likely to damage the hose. That's my opinion; I haven't researched those clamps. Al ------=_NextPart_000_0001_01C80930.FC978DD0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

   Maybe this is one of those = things that isn't terribly obvious, but -
having used a variety of screw type clamps - I'm wondering why
plain old spring clamps aren't suitable for this application.  I = can't
ever remember having one fail in service.  (photos below)

Dale R.

I think they are fine for small diameter hoses for little and/or low = pressure.  I doubt they get the clamping force needed for coolant system pressures; = so on a plane I wouldn’t trust them for even small hoses. The spring = wire version concentrates the force on such a small area more likely to = damage the hose.

That’s my opinion; I haven’t researched those clamps.

Al

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