X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail22.syd.optusnet.com.au ([211.29.133.160] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTPS id 1027880 for flyrotary@lancaironline.net; Thu, 30 Jun 2005 18:45:47 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.160; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-107-82.dsl.nsw.optusnet.com.au [211.31.107.82]) by mail22.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j5UMivEk032689 for ; Fri, 1 Jul 2005 08:44:59 +1000 Message-ID: <000d01c57dc5$619485c0$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 08:45:13 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C57E19.32A95ED0" 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_000A_01C57E19.32A95ED0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, Or just extend the outer tube a bit more. The trumpet shape may be a bit = difficult to manufacture. George ( down under) 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_000A_01C57E19.32A95ED0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Bill,

Or just extend the outer tube a = bit more. The=20 trumpet shape may be a bit difficult to manufacture.

George ( down under)

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=20 into the exhaust to lower the exit temps and make the piping easier = in the=20 cowl. 2. Make a second drag surface to absorb some of the = exhaust=20 energy and make the muffler quieter. 3. Draw the air through the = muffler to=20 help cool the muffler itself. The inverted version I just = posted might=20 be better for heat shielding. 4. Lastly cool the exhaust output = itself =20 so the pipe exit doesn't need to be stood off as far to avoid = burning the=20 paint off the belly. Hope that helps. I'm reposting the 2nd version = in case=20 you missed the 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=20 -0400
Subject: [FlyRotary] Re: P Ports working on dyno

Jerry, That is not what I understood, but I'll take your word = for it.=20 I 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.) = 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=20 fact 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. =20 Ed K, you around to clear this up?

Tracy (still don't 'get' the = VAM=20 concept)

/List.html

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

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