X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail25.syd.optusnet.com.au ([211.29.133.166] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTPS id 1028170 for flyrotary@lancaironline.net; Fri, 01 Jul 2005 02:58:29 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.166; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-107-82.dsl.nsw.optusnet.com.au [211.31.107.82]) by mail25.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j616vaVa026098 for ; Fri, 1 Jul 2005 16:57:39 +1000 Message-ID: <003101c57e0a$34bea810$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 16:57:53 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002E_01C57E5E.05A59350" 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_002E_01C57E5E.05A59350 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, I think we have settled on extending the front over the coned guide, = which could be ( in itself) part of the internal muffler volume. To get the internal OD centred on the external ID, you could put in = angled spacers to create or assist the vortex. I think the flat area adjacent to the outlets might be best if it's an = addition, in case it burns through, you still have the OD of the tube This could be mounted externally to take full advantage of the RAM = effect. We could say it Jet assist. It's not really a lie! What is the recommended dimensions? I would like to start working on that - for my single! Would look very spectacular all polished-up on a demonstrator!!=20 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_002E_01C57E5E.05A59350 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bill,
I think we have settled on extending = the front over=20 the coned guide, which could be ( in itself) part of the internal = muffler=20 volume.
 
To get the = internal OD centred on the=20 external ID, you could put in angled spacers  to create or = assist=20 the vortex.
I think the flat area adjacent to the = outlets might=20 be best if it's an addition, in case it burns through, you still have = the OD of=20 the tube
 
This could be mounted = externally to take full=20 advantage of the RAM effect.
 
We could say it Jet = assist.
It's not really a lie!
What is the recommended=20 dimensions?
I would like to start working on that - = for my=20 single!
Would look very spectacular all = polished-up on a=20 demonstrator!! 
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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