X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail01.syd.optusnet.com.au ([211.29.132.182] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTPS id 3411976 for flyrotary@lancaironline.net; Mon, 05 Jan 2009 16:10:01 -0500 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.182; envelope-from=lendich@optusnet.com.au Received: from george (d58-109-48-212.dsl.nsw.optusnet.com.au [58.109.48.212]) by mail01.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id n05L9Itg014321 for ; Tue, 6 Jan 2009 08:09:19 +1100 Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: 20B install issues overcome Date: Tue, 6 Jan 2009 07:09:22 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0034_01C96FCD.B37ECBE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 090105-0, 05/01/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0034_01C96FCD.B37ECBE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, I had a talk with Mistral a while back and the chief engineer had some = concerns with introducing fresh air into the exhaust ( for cooling) as = it might initiate burning of residual fuel - hence more heat rather than = less heat. That's why their cool tube (over the exhaust tube) is discharged = separate to the exhaust. Although I intend to proceed with out original design just to see the = results. Do you have any comments on this ? George (down under) Earnest, I believe that the SuperTrapp muffler is an example of a band gap = device and it worked well, if properly tuned. I think the large block idea has merit too, but you will have to allow = enough thickness to prevent the tubes that see the exhaust first to = fight the harmonic vibration and heat. Different size diamonds in the = exhaust stream might also help fight harmonics. Bill Jepson -------------------------------------------------------------------------= ----- Get a free MP3 every day with the Spinner.com Toolbar. Get it Now. ------=_NextPart_000_0034_01C96FCD.B37ECBE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bill,
I had a talk with Mistral a while back = and the=20 chief engineer had some concerns with introducing fresh air into the = exhaust (=20 for cooling) as it might initiate burning of residual fuel - hence more = heat=20 rather than less heat.
That's why their cool tube (over the = exhaust tube)=20 is discharged separate to the exhaust.
Although I intend to proceed with out = original=20 design just to see the results.
Do you have any comments on this = ?
George (down under)
Earnest,
I=20 believe that the SuperTrapp muffler is an example of a band gap device = and it=20 worked well, if properly tuned.
I think the large block idea has = merit too,=20 but you will have to allow enough thickness to prevent the tubes that = see the=20 exhaust first to fight the harmonic vibration and heat. Different size = diamonds in the exhaust stream might also help fight = harmonics.
Bill=20 Jepson


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