X-Virus-Scanned: clean according to Sophos on Logan.com From: "Dennis Havarlah" Received: from [107.14.166.227] (HELO cdptpa-oedge-vip.email.rr.com) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9391331 for flyrotary@lancaironline.net; Sat, 21 Jan 2017 17:21:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=107.14.166.227; envelope-from=clouduster@austin.rr.com Return-Path: Received: from [70.113.112.169] ([70.113.112.169:59484] helo=DWHPC) by cdptpa-omsmta02 (envelope-from ) (ecelerity 3.6.9.48312 r(Core:3.6.9.0)) with ESMTP id 46/6B-28949-4FED3885; Sat, 21 Jan 2017 22:21:40 +0000 Message-ID: To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] exhaust wraps and blankets Date: Sat, 21 Jan 2017 16:21:19 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04CE_01D27402.661DC7B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.19705 X-RR-Connecting-IP: 107.14.168.7:25 This is a multi-part message in MIME format. ------=_NextPart_000_04CE_01D27402.661DC7B0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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.=20 Anyone have any experience with these on the rotary? Thanks, Dennis Haverlah ------=_NextPart_000_04CE_01D27402.661DC7B0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF

After about 700 hours and 8 years = flying I have=20 decided to design and build a new exhaust system for my RV-7A powered by = a 4=20 port RX 8 Renesis engine. Bobby Hughes has offered advice and = greatly=20 assisted me in this endeavor.

The new exhaust was designed with three = header=20 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=20 combination of 3 inch and 2.5 inch pipe take the exhaust down and out = the bottom=20 of the cowl and the exhaust exits about 12 inches back from the=20 firewall.

I have flown with the new exhaust and = discovered it=20 causes a lot more vibration to the airframe than the old exhaust. = (I have=20 a ball joint in the down pipe at the firewall). I want to add a = flexible=20 joint down stream of the 3 to 1 collector and have about 3 = inches space for=20 it. MY Question - Has anyone used a flex coupling = or a=20 flex bellows as seen on Summits web site? The flex coupling is a = woven=20 stainless joint with a liner inside and weldable ends. The flex = bellows=20 looks like a metal bellows on the outside and has a slip joint built=20 inside.

Anyone have any experience with = these on the=20 rotary?

Thanks,

Dennis Haverlah

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