X-Virus-Scanned: clean according to Sophos on Logan.com From: "Steven W. Boese" Received: from [104.47.41.112] (HELO NAM03-DM3-obe.outbound.protection.outlook.com) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9391750 for flyrotary@lancaironline.net; Sat, 21 Jan 2017 22:35:21 -0500 Received-SPF: none receiver=logan.com; client-ip=104.47.41.112; envelope-from=SBoese@uwyo.edu DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=uwy.onmicrosoft.com; s=selector1-uwyo-edu; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=HmRGBGnJ8DjuyoaJKJp9sn2+LNiueMYS36GFR2sALlk=; b=NJUBdQzGvIUOkhGgnueIZU6WOQncKNM7V/IYH4SAzTxlL/0SvVxCIUU2DuqdxottIyBI8puUHQk0P4VaGx82EYD6gM/Sk6Yy1yJOXGkTf2Cq21lkplMx2AdQJ8Zga5zw2u4GqNsCEpvQf2yuSwxiJnjGB+CyamkM59Q7FLCo+uM= Received: from CY1PR05MB2201.namprd05.prod.outlook.com (10.166.192.13) by CY1PR05MB2204.namprd05.prod.outlook.com (10.166.192.16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.874.6; Sun, 22 Jan 2017 03:35:02 +0000 Received: from CY1PR05MB2201.namprd05.prod.outlook.com ([10.166.192.13]) by CY1PR05MB2201.namprd05.prod.outlook.com ([10.166.192.13]) with mapi id 15.01.0874.009; Sun, 22 Jan 2017 03:35:02 +0000 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: exhaust wraps and blankets Thread-Topic: [FlyRotary] Re: exhaust wraps and blankets Thread-Index: AQHSdDTM3bCS8RrCFES1jrkGXUSG0KFD0tXs Date: Sun, 22 Jan 2017 03:35:02 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=SBoese@uwyo.edu; x-originating-ip: [69.146.90.23] x-ms-office365-filtering-correlation-id: ec3b6666-0f57-422d-b973-08d44277a641 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001);SRVR:CY1PR05MB2204; x-microsoft-exchange-diagnostics: 1;CY1PR05MB2204;7:s0Zfwg6nAjSQp+LnnqFheMWCD7Ccg8FwJwFFYN5ElpUhcDuyvv+zgzjprN8bZmYHLzQDR5S7iWswQaKdQ1d1eYRw5DJq4d2vu150pAc+kkcIAzKKmt6AyEh+lsP0AmYQzdXEiPQ6BfKL01v4DiBMCk6hegxwiEJWxSVOTDGCqRaxX+zZz7LyEvPGOHdb7nID12+oFY7YOo6ah/ywUSSQGKDOsxxa3BSdzBXF8mpV6njoV9lWiI84YHB0vR6e3tOwKh2FzfgySwFCX/fFO28wxlUUhyXoTNsfv4uMPJJqjKoxjj7NN5/LVvUFK9wU8Gqqe3rMncv0bjNvcrDa8bFrJ/zHBIxwhDnshwwXbhb7HMAO9XE7zFvn3jHbIzC4Qh1n4ouNIy75palwjdJQG1z8LS4sKeMHsqxq+YvMmnRgrIRYY8P7I7doAN/0oMws7WLtvs3tsqbw1T7aKpF1/3aHKA== x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(17755550239193); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(6040375)(601004)(2401047)(5005006)(8121501046)(3002001)(10201501046)(6041248)(20161123560025)(20161123562025)(20161123555025)(20161123564025)(6072148);SRVR:CY1PR05MB2204;BCL:0;PCL:0;RULEID:;SRVR:CY1PR05MB2204; x-forefront-prvs: 01952C6E96 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(7916002)(39450400003)(199003)(377454003)(189002)(2950100002)(6916009)(7736002)(2900100001)(6436002)(229853002)(3660700001)(88552002)(3280700002)(3846002)(102836003)(25786008)(53936002)(105586002)(6116002)(92566002)(54896002)(55016002)(38730400001)(106356001)(99286003)(19627405001)(106116001)(9686003)(33656002)(7696004)(68736007)(86362001)(97736004)(107886002)(6506006)(74316002)(110136003)(81156014)(81166006)(189998001)(122556002)(80792005)(50986999)(77096006)(2906002)(8936002)(8676002)(5660300001)(101416001)(66066001)(76176999)(54356999)(75432002)(450100001);DIR:OUT;SFP:1102;SCL:1;SRVR:CY1PR05MB2204;H:CY1PR05MB2201.namprd05.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; received-spf: None (protection.outlook.com: uwyo.edu does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_CY1PR05MB2201F96FD2C1F835B9786815B9730CY1PR05MB2201namp_" MIME-Version: 1.0 X-OriginatorOrg: uwyo.edu X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jan 2017 03:35:02.3448 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f9cdd7ad-825d-4601-8e9c-a325e02d52da X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR05MB2204 --_000_CY1PR05MB2201F96FD2C1F835B9786815B9730CY1PR05MB2201namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dennis, Just aft of the firewall, I initially used a stainless flexible joint with = the woven exterior. It also had a woven layer inside of the bellows. The = interior layer swelled up and quieted the exhaust for a short time. Then a= fter about 20 hours, suddenly those wires blew out into the muffler. The p= ieces of wire in the muffler were mostly about an inch long or less and did= n't cause a blockage. After about 150 hours, the bellows burned through and was replaced by a bal= l joint. Steve Boese ________________________________ From: Rotary motors in aircraft on behalf of = Dennis Havarlah Sent: Saturday, January 21, 2017 3:21:19 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: exhaust wraps and blankets After about 700 hours and 8 years flying I have decided to design and build= a new exhaust system for my RV-7A powered by a 4 port RX 8 Renesis engine.= Bobby Hughes has offered advice and greatly assisted me in this endeavor. The new exhaust was designed with three header pipes routed into a 3 to 1 c= ollector that is 3 inches in diameter. The headers and collector direct th= e exhaust toward the firewall. A combination of 3 inch and 2.5 inch pipe t= ake the exhaust down and out the bottom of the cowl and the exhaust exits a= bout 12 inches back from the firewall. I have flown with the new exhaust and discovered it causes a lot more vibra= tion to the airframe than the old exhaust. (I have a ball joint in the dow= n pipe at the firewall). I want to add a flexible joint down stream of the= 3 to 1 collector and have about 3 inches space for it. MY Question - Ha= s anyone used a flex coupling or a flex bellows as seen on Summits web site= ? The flex coupling is a woven stainless joint with a liner inside and wel= dable ends. The flex bellows looks like a metal bellows on the outside and= has a slip joint built inside. Anyone have any experience with these on the rotary? Thanks, Dennis Haverlah --_000_CY1PR05MB2201F96FD2C1F835B9786815B9730CY1PR05MB2201namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dennis,


Just aft of the firewall, I initially used a stainless flexible joint wi= th the woven exterior.  It also had a woven layer inside of the bellow= s.  The interior layer swelled up and quieted the exhaust for a short = time.  Then after about 20 hours, suddenly those wires blew out into the muffler.  The pieces of wire in the muffler w= ere mostly about an inch long or less and didn't cause a blockage. 


After about 150 hours, the bellows burned through and was replaced by a = ball joint. 


Steve Boese

From: Rotary motors in airc= raft <flyrotary@lancaironline.net> on behalf of Dennis Havarlah <f= lyrotary@lancaironline.net>
Sent: Saturday, January 21, 2017 3:21:19 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: exhaust wraps and blankets
 
After about 700 hours and 8 years flyi= ng I have decided to design and build a new exhaust system for my RV-7A pow= ered by a 4 port RX 8 Renesis engine.  Bobby Hughes has offered advice= and greatly assisted me in this endeavor.
 
The new exhaust was designed with thre= e header pipes routed into a 3 to 1 collector that is 3 inches in diameter.=   The headers and collector direct the exhaust toward the firewal= l.  A combination of 3 inch and 2.5 inch pipe take the exhaust down and out the bottom of the cowl and the exhaust = exits about 12 inches back from the firewall.
 
I have flown with the new exhaust and = discovered it causes a lot more vibration to the airframe than the old exha= ust.  (I have a ball joint in the down pipe at the firewall).  I = want to add a flexible joint down stream of the 3 to 1 collector and have about 3 inches space for it.  MY = Question  -  Has anyone used a flex coupling or a flex bellows as= seen on Summits web site?  The flex coupling is a woven stainless joi= nt with a liner inside and weldable ends.  The flex bellows looks like a metal bellows on the outside and has a slip joint built inside. 
 
Anyone  have any experience with = these on the rotary?
 
Thanks,
 
Dennis Haverlah
 
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