X-Virus-Scanned: clean according to Sophos on Logan.com From: Received: from resqmta-ch2-01v.sys.comcast.net ([69.252.207.33] verified) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9391764 for flyrotary@lancaironline.net; Sat, 21 Jan 2017 23:26:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=69.252.207.33; envelope-from=hoursaway1@comcast.net Received: from resomta-ch2-10v.sys.comcast.net ([69.252.207.106]) by resqmta-ch2-01v.sys.comcast.net with SMTP id V9iwcjhGyRNZDV9jGcsDuJ; Sun, 22 Jan 2017 04:26:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1485059170; bh=ZiPANsQ4ho5S9pO8gO7XZ6Id/H9qHafRXhiyrqW7AUw=; h=Received:Received:Date:From:To:Message-ID:Subject:MIME-Version: Content-Type; b=nShG73on1AjKowFYHrg0tKIaQ8rCLNT64mWOYPuZtryrD55cdWuRTG80KPa6FPnxc feWnFTF/WiwP6hD3gdLMbyWCkj3IxGdpqfsLYak4kGhf+GWm69lsTihAcL/BYMWN/s UdmSwEhvfs6rcl8HNhakrENz/GC9ZWTgYlOwmmRN3znTbFQ+fOeG+gSKxz/GIHJDwP OCblCGmFTlSh2gQthUMS9Z+oJIO3W1fUt7f5CZrKlrINkDPIoegeQKuSpJBZOeaHbp u9ChYKGY9Tka6yc9ILMEsxKrziaZTYV1y564jH6ISDT4nyMhg4N/bbRE0ZAWcQdH/y 9Br/WQZ9kdHSQ== Received: from resmail-ch2-632v.sys.comcast.net ([162.150.50.156]) by resomta-ch2-10v.sys.comcast.net with SMTP id V9jGcusF0O57CV9jGcTucb; Sun, 22 Jan 2017 04:26:10 +0000 Date: Sun, 22 Jan 2017 04:26:10 +0000 (UTC) To: "Fly rotary blog, e-mail" Message-ID: <825288756.99126417.1485059170529.JavaMail.zimbra@comcast.net> In-Reply-To: References: Subject: Re: [FlyRotary] Re: exhaust wraps and blankets MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_99126416_542318432.1485059170524" X-Originating-IP: [::ffff:68.49.229.174] X-Mailer: Zimbra 8.0.7_GA_6031 (ZimbraWebClient - GC51 (Win)/8.0.7_GA_6031) Thread-Topic: exhaust wraps and blankets Thread-Index: 1lBLdgiX3YLlVGdg5IYrix2rrxsKig== X-CMAE-Envelope: MS4wfDfb5eJaJNh/jqAkbo8GpRjAiY1cHJDdkwaw7QpNC9zelhbMACqq40QsN02l7sXUIV9dbxE241kkcYO17hSLkH9OotQQG+2nctWYEZAyTk0ELHmj3LRW ideIh8Lm3D4sy1QMRCGHNvJ+PHqBaGY0IzuudZLrq1wr9/CdnKAxRHJPB1bHcqQHEa/6bySSBvufrfD6E8zZbU61WP88ul9v3j8= ------=_Part_99126416_542318432.1485059170524 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi Steve, sounds like I should perform an upgrade, flex to ball, before spring flying starts. David R. Cook RV6A Rotary ----- Original Message ----- From: "Steven W. Boese" To: "Rotary motors in aircraft" Sent: Saturday, January 21, 2017 10:35:02 PM Subject: [FlyRotary] Re: exhaust wraps and blankets 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 after about 20 hours, suddenly those wires blew out into the muffler. The pieces of wire in the muffler were 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 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 collector that is 3 inches in diameter. The headers and collector direct the exhaust toward the firewall. 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 exhaust. (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 joint 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 ------=_Part_99126416_542318432.1485059170524 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit
Hi Steve,   sounds like I should perform an upgrade, flex to ball, before spring flying starts.  David R. Cook RV6A Rotary


From: "Steven W. Boese" <flyrotary@lancaironline.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, January 21, 2017 10:35:02 PM
Subject: [FlyRotary] Re: exhaust wraps and blankets

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 after about 20 hours, suddenly those wires blew out into the muffler.  The pieces of wire in the muffler were 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 aircraft <flyrotary@lancaironline.net> on behalf of Dennis Havarlah <flyrotary@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 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 collector that is 3 inches in diameter.  The headers and collector direct the exhaust toward the firewall.  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 exhaust.  (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 joint 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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