X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail03.syd.optusnet.com.au ([211.29.132.184] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTPS id 2958984 for flyrotary@lancaironline.net; Sun, 08 Jun 2008 18:17:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.184; envelope-from=lendich@optusnet.com.au Received: from george (d58-104-215-70.dsl.nsw.optusnet.com.au [58.104.215.70]) by mail03.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m58MGtXc015552 for ; Mon, 9 Jun 2008 08:16:56 +1000 Message-ID: <003101c8c9b5$5cb098c0$6400a8c0@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Muffler failed designs. Date: Mon, 9 Jun 2008 08:16:54 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002E_01C8CA09.2DA05DA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_002E_01C8CA09.2DA05DA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Michael, Good idea but it's very heavy way to go and expensive, the goal has = always been to get a result with a lighter and cheaper unit. Bill Jepson = and myself have come up with a design but it's still a bit heavy. I have = been discussing exhausts with Francois and have offered the design to = Mistral to try to see if it works - but it will always be a bit heavy = (1.6mm mostly) - perhaps there's no getting away from that. I haven't been in a hurry to finish it and it's been at the welders for = some considerable time now, however I have taken that time to = re-evaluate it. The recent Everett Hatch method put up by PL is a good = idea to eliminate the problems associated by pipe to flange welding, but = it may have some production issue and may have to be a stamped part. George ( down under) An open question to the collective knowledge of this group on the = subject of exhaust systems.=20 Has anyone installed an exhaust with a manifold box like the original = N/A 13B ?=20 In other words, what about building a box collector of similar = dimensions to the original heavy cast iron unit on the N/A 13B but made = out of say .120 thou SS ?=20 Would this help dampen the exhaust pulses ? Or are we just opening a = whole new can of worms by going down that track?=20 I think it would leave some HP on the table but for someone like = myself not seekeing any more than about 160 hp out of my application is = it reasonable? Michael in Maine Falconar F12 at glacial pace. -------------------------------------------------------------------------= ----- Internal Virus Database is out-of-date. Checked by AVG.=20 Version: 7.5.524 / Virus Database: 269.24.1/1469 - Release Date: = 27/05/2008 1:25 PM ------=_NextPart_000_002E_01C8CA09.2DA05DA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Michael,
Good idea but it's very heavy way to go = and=20 expensive, the goal has always been to get a result with a lighter and = cheaper=20 unit. Bill Jepson and myself have come up with a design but it's still a = bit=20 heavy. I have been discussing exhausts with Francois and have offered = the=20 design to Mistral to try to see if it works - but it will always be = a bit=20 heavy (1.6mm mostly) - perhaps there's no getting away from = that.
 
I haven't been in a hurry to finish it = and it's=20 been at the welders for some considerable time now, however I = have taken=20 that time to re-evaluate it. The recent Everett Hatch method put up by = PL is a=20 good idea to eliminate the problems associated by pipe to flange = welding, but it=20 may have some production issue and may have to be a=20 stamped part.
George ( down under)

An open question to the collective knowledge of this group on the = subject=20 of exhaust systems.

Has anyone installed an exhaust with a manifold box like the = original N/A=20 13B ? 

In other words, what about building a box collector of similar = dimensions=20 to the original heavy cast iron unit on the N/A 13B but made out of = say .120=20 thou SS ?

Would this help dampen the exhaust pulses ? Or are we just = opening a=20 whole new can of worms by going down that track?

I think it would leave some HP on the table but for someone = like=20 myself not seekeing any more than about 160 hp out=20 of my application is it reasonable?

Michael in Maine

Falconar F12 at glacial pace.

Internal Virus Database is out-of-date.
Checked by AVG. =
Version:=20 7.5.524 / Virus Database: 269.24.1/1469 - Release Date: 27/05/2008 = 1:25=20 PM
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