X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rwcrmhc14.comcast.net ([204.127.192.84] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2375028 for flyrotary@lancaironline.net; Mon, 08 Oct 2007 07:16:08 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.192.84; envelope-from=wschertz@comcast.net Received: from rmailcenter75.comcast.net ([204.127.197.157]) by comcast.net (rwcrmhc14) with SMTP id <20071008111528m1400ov5ske>; Mon, 8 Oct 2007 11:15:28 +0000 Received: from [75.132.134.105] by rmailcenter75.comcast.net; Mon, 08 Oct 2007 11:15:27 +0000 From: wschertz@comcast.net To: "Rotary motors in aircraft" Subject: St. Louis area rotary builders Date: Mon, 08 Oct 2007 11:15:27 +0000 Message-Id: <100820071115.7744.470A114F00088A7200001E402206424613969B9D0A080C9C99@comcast.net> X-Mailer: AT&T Message Center Version 1 (Oct 4 2006) X-Authenticated-Sender: d3NjaGVydHpAY29tY2FzdC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="NextPart_Webmail_9m3u9jl4l_7744_1191842127_0" --NextPart_Webmail_9m3u9jl4l_7744_1191842127_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit I am in the St. Louis area today (Monday) and wondered if there were any rotary engine plane builders in the area that I could visit? Bill Schertz --NextPart_Webmail_9m3u9jl4l_7744_1191842127_0 Content-Type: message/rfc822 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: [FlyRotary] Re: Hose clamp myth busters Date: Mon, 8 Oct 2007 05:25:20 +0000 Content-Type: Multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_7744_1191842127_1" --NextPart_Webmail_9m3u9jl4l_7744_1191842127_1 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.

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