X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3812568 for flyrotary@lancaironline.net; Thu, 13 Aug 2009 20:55:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta02.mail.rr.com with ESMTP id <20090814005517788.PZZV22035@cdptpa-omta02.mail.rr.com> for ; Fri, 14 Aug 2009 00:55:17 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Moving muffler to belly Date: Thu, 13 Aug 2009 20:53:24 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01CA1C58.1980ED60" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AcocdbSWqJ2FhKk4SgSNDRdQY2SvawAA4hkQ In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20090814005517788.PZZV22035@cdptpa-omta02.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_0009_01CA1C58.1980ED60 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Yes, you really don't want to hang a potential "bomb" by 0.032 sheet metal. Numerous ways to do it. I put a piece of scrap aluminum angle inside riveted against a vertical structure (floor rib as I recall). Then I put a rivet nut/plate nut on that to carry the load of the muffler - has worked for a number of years including one landing so hard I bent the main gear. Mufflers stay in place {:>) Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes Sent: Thursday, August 13, 2009 9:27 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Moving muffler to belly Thanks for the input everyone. The front of the muffler can be supported from the motor mount. The rear muffler mount is the dilemma. I hate the idea of an external doubler but I think it really needs one. Bobby _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Thursday, August 13, 2009 12:10 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Moving muffler to belly Mine is less than 1" from the belly to keep it in the turbulent slipstream behind the cooling exit and avoid drag. A .007" thick piece of SS heat shield is riveted to the belly in this area. The SS expands when heated and creates its own airgap for insulation. Tracy On Thu, Aug 13, 2009 at 10:08 AM, Bobby J. Hughes wrote: I've had the plane down for a few weeks making several changes. I would like to move my muffler out of the cowl to the airframe belly. How much space should I leave between the top of the muffler and bottom skin? My exit fairing hangs down about 5" below the airframe. What have others done for heat shielding \ paint protection? Since the floor pans are installed any riveting will have to be with blind rivets. Don't really want to put a bunch of extra holes in the skin for this experiment. Any advice or pictures would be appreciated. Thanks, Bobby Hughes RV-10 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_0009_01CA1C58.1980ED60 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Yes, you really don’t want to = hang a potential “bomb” by 0.032 sheet metal.  Numerous ways = to do it.  I put a piece of scrap aluminum angle inside riveted against a vertical structure (floor rib as I recall). Then I put a rivet nut/plate = nut on that to carry the load of the muffler – has worked for a number of = years including one landing so hard I bent the main gear. Mufflers stay in = place {:>)

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Thursday, August = 13, 2009 9:27 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Moving muffler to belly

 

Thanks for the input everyone. The = front of the muffler can be supported from the motor mount. The rear muffler = mount is the dilemma. I hate the idea of an external doubler but I think it = really needs one.

 

Bobby

 

From: Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy = Crook
Sent: Thursday, August = 13, 2009 12:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Moving muffler to belly

Mine is less = than 1" from the belly to keep it in the turbulent slipstream behind the cooling = exit and avoid drag.  A .007" thick piece of SS heat shield is = riveted to the belly in this area.  The SS expands when heated and creates its = own airgap for insulation.

Tracy  =

On Thu, Aug 13, 2009 at 10:08 AM, Bobby J. Hughes <bhughes@qnsi.net> = wrote:

I've had the plane down for a few weeks making = several changes. I would like to move my muffler out of the cowl to the airframe = belly. How much space should I leave between the top of the muffler and bottom = skin? My exit fairing hangs down about 5" below the airframe. What have = others done for heat shielding \ paint protection? Since the floor pans = are installed any riveting will have to be with blind rivets. Don't really = want to put a bunch of extra holes in the skin for this experiment. Any = advice or pictures would be appreciated.

 

Thanks,

 

Bobby Hughes

RV-10


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