X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail26.syd.optusnet.com.au ([211.29.133.167] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTPS id 1027872 for flyrotary@lancaironline.net; Thu, 30 Jun 2005 18:31:17 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.167; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-107-82.dsl.nsw.optusnet.com.au [211.31.107.82]) by mail26.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j5UMUTZr007539 for ; Fri, 1 Jul 2005 08:30:30 +1000 Message-ID: <012a01c57dc3$5baa0150$526b1fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: P Ports working on dyno Date: Fri, 1 Jul 2005 08:30:45 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0127_01C57E17.2CE1F2C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0127_01C57E17.2CE1F2C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, How about a trumpet ( bell shaped) leading outer edge to help with the = inlet and flow characteristics. Now were getting somewhere! George ( down under) Tracy,=20 There are several parts to the VAM pipe. 1. Introduce cool air into = the exhaust to lower the exit temps and make the piping easier in the = cowl. 2. Make a second drag surface to absorb some of the exhaust energy = and make the muffler quieter. 3. Draw the air through the muffler to = help cool the muffler itself. The inverted version I just posted might = be better for heat shielding. 4. Lastly cool the exhaust output itself = so the pipe exit doesn't need to be stood off as far to avoid burning = the paint off the belly. Hope that helps. I'm reposting the 2nd version = in case you missed the earlier message to Jerry. Bill Jepson=20 =20 -----Original Message----- From: Tracy Crook To: Rotary motors in aircraft Sent: Thu, 30 Jun 2005 16:16:15 -0400 Subject: [FlyRotary] Re: P Ports working on dyno =20 Jerry, That is not what I understood, but I'll take your word for = it. I also would mention that I Muffed the name, I intended to reply to = Rusty ,(since you, Jerry are well aware of the going's on with the VAM.) = If Ed DIDN'T put the center tube thru to the tail pipe the VAM simply = WOULDN'T WORK! The center tube must be placed in the center, (in fact = partially inside) of the tail pipe. Did you get the jpeg? Bill Jepson =20 From memory (perhaps foggy) the VAM muffler tested here on my engine = stand did have the center pipe but I don't know exactly where it = terminated. There was no tail pipe on during the test due to clearance = with test stand hardware. Ed K, you around to clear this up?=20 Tracy (still don't 'get' the VAM concept) /List.html=20 -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0127_01C57E17.2CE1F2C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Bill,

How about a trumpet ( bell shaped) = leading=20 outer edge to help with the inlet and flow = characteristics.

Now were getting = somewhere!

George ( down under)

Tracy,

There are several parts to the VAM pipe. 1. Introduce cool = air into=20 the exhaust to lower the exit temps and make the piping easier in the = cowl.=20 2. Make a second drag surface to absorb some of the exhaust = energy and=20 make the muffler quieter. 3. Draw the air through the muffler to help = cool the=20 muffler itself. The inverted version I just posted might be = better for=20 heat shielding. 4. Lastly cool the exhaust output itself so the = pipe=20 exit doesn't need to be stood off as far to avoid burning the paint = off the=20 belly. Hope that helps. I'm reposting the 2nd version in case you = missed the=20 earlier message to Jerry.

Bill Jepson

-----Original = Message-----
From:=20 Tracy Crook <lors01@msn.com>
To: Rotary motors in aircraft=20 <flyrotary@lancaironline.net>
Sent: Thu, 30 Jun 2005 16:16:15 = -0400
Subject: [FlyRotary] Re: P Ports working on dyno

Jerry, That is not what I understood, but I'll take your word = for it. I=20 also would mention that I Muffed the name, I intended to reply to = Rusty=20 ,(since you, Jerry are well aware of the going's on with the VAM.)=20 If Ed DIDN'T put the center tube thru to the tail pipe the VAM = simply=20 WOULDN'T WORK! The center tube must be placed in the center, = (in fact=20 partially inside) of the tail pipe. Did you get the jpeg?

Bill Jepson

From memory = (perhaps=20 foggy) the VAM muffler tested here on my engine stand did have the = center=20 pipe but I don't know exactly where it terminated. There was = no tail=20 pipe on during the test due to clearance with test stand = hardware. Ed=20 K, you around to clear this up?

Tracy (still don't 'get' the VAM = concept)

/List.html

>> Homepage: =20 http://www.flyrotary.com/
>> Archive: =20 = http://lancaironline.net/lists/flyrotary/List.html
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