X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3876759 for flyrotary@lancaironline.net; Tue, 06 Oct 2009 17:01:04 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id 1B3EE17387A for ; Wed, 7 Oct 2009 05:00:26 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 16B14BEC018 for ; Wed, 7 Oct 2009 05:00:24 +0800 (WST) Message-ID: <8CDE18AA4F8A471484962307B6C01A7C@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Photos of Fan muffler Date: Wed, 7 Oct 2009 07:00:25 +1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 091006-0, 10/06/2009), Outbound message X-Antivirus-Status: Clean Ed, Cones are the GO. Any bare edge will take a battering from the heat and shock waves. Cones formed back to back eliminate any edges. There must be supporting structure for the cones, I've used 1/4" solid round bar welded into the exhaust skin. George (down under) > As you can see a couple of the fan blades have been beating off by the > exhaust pulse. I think at least part of the reason is that the tips were > unsupported (i.e. not welded to the tube wall) which of course made them > very susceptible to fatigue from the pulses. > > Also, if I had the time, I would probably have tried to form more of a > cone > shape with the discs to reduce the surface area of the disc perpendicular > to > the shock wave. But, too many projects and not enough time {:>) > > Ed > The message is ready to be sent with the following file or link > attachments: > > MVC-006F.JPG > MVC-011F.JPG > > > Note: To protect against computer viruses, e-mail programs may prevent > sending or receiving certain types of file attachments. Check your e-mail > security settings to determine how attachments are handled. > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature > database 3267 (20080714) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > -------------------------------------------------------------------------------- > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html >