X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-4.exch003intermedia.net ([207.5.74.111] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3876261 for flyrotary@lancaironline.net; Tue, 06 Oct 2009 08:59:19 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.111; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-4.exch003intermedia.net ([207.5.74.111]) with mapi; Tue, 6 Oct 2009 05:58:42 -0700 From: Jeff Whaley To: Rotary motors in aircraft Date: Tue, 6 Oct 2009 05:59:32 -0700 Subject: RE: [FlyRotary] Photos of Fan muffler Thread-Topic: [FlyRotary] Photos of Fan muffler Thread-Index: AcpGgrszikAk1kqDRJW0VI8h1Qz2GgAATOFQ Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Thanks Ed for the drawing and photos ... you do have some great ideas! I li= ke this one! The drawing doesn't identify the inside tube as perforated - guess that is = for weight savings, as it would be a slip fit into the outer ... a 4 foot l= ong muffler eh? That should get the sound past at least the front seats of = most airplanes. Jeff -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Ed Anderson Sent: Tuesday, October 06, 2009 8:53 AM To: Rotary motors in aircraft Subject: [FlyRotary] Photos of Fan muffler As you can see a couple of the fan blades have been beating off by the exha= ust pulse. I think at least part of the reason is that the tips were unsup= ported (i.e. not welded to the tube wall) which of course made them very su= sceptible 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 =20 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 send= ing or receiving certain types of file attachments. Check your e-mail secu= rity settings to determine how attachments are handled. =20 __________ Information from ESET NOD32 Antivirus, version of virus signatur= e database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com =20